Month Percent 1960-01-01 0.236732882 1960-02-01 0.124885543 1960-03-01 0.036174625 1960-04-01 0.028206834 1960-05-01 0.019088613 1960-06-01 0.017043404 1960-07-01 0.012654728 1960-08-01 0.013166030 1960-09-01 0.018705136 1960-10-01 0.022582510 1960-11-01 0.024201634 1960-12-01 0.072306642 1961-01-01 0.123820259 1961-02-01 0.036413325 1961-03-01 0.014841982 1961-04-01 0.012038081 1961-05-01 0.010168814 1961-06-01 0.007925693 1961-07-01 0.006579821 1961-08-01 0.007065830 1961-09-01 0.008112620 1961-10-01 0.013309182 1961-11-01 0.013645651 1961-12-01 0.036226398 1962-01-01 0.075593165 1962-02-01 0.032973873 1962-03-01 0.014094275 1962-04-01 0.009308951 1962-05-01 0.008897712 1962-06-01 0.006355509 1962-07-01 0.006617206 1962-08-01 0.006916289 1962-09-01 0.007439683 1962-10-01 0.012112851 1962-11-01 0.018094506 1962-12-01 0.070508759 1963-01-01 0.183038643 1963-02-01 0.081275738 1963-03-01 0.016972946 1963-04-01 0.009757575 1963-05-01 0.008598629 1963-06-01 0.006916289 1963-07-01 0.005533031 1963-08-01 0.005308719 1963-09-01 0.006392894 1963-10-01 0.007252757 1963-11-01 0.009832345 1963-12-01 0.029085798 1964-01-01 0.039217226 1964-02-01 0.011327759 1964-03-01 0.009047253 1964-04-01 0.006505050 1964-05-01 0.004822709 1964-06-01 0.005196563 1964-07-01 0.004149773 1964-08-01 0.004860095 1964-09-01 0.004448856 1964-10-01 0.007327527 1964-11-01 0.008860327 1964-12-01 0.023590152 1965-01-01 0.030581211 1965-02-01 0.024936024 1965-03-01 0.009869731 1965-04-01 0.005794728 1965-05-01 0.005159177 1965-06-01 0.005233948 1965-07-01 0.003289910 1965-08-01 0.004374085 1965-09-01 0.004374085 1965-10-01 0.006205967 1965-11-01 0.012449320 1965-12-01 0.021795655 1966-01-01 0.057685586 1966-02-01 0.010355740 1966-03-01 0.007103215 1966-04-01 0.006280738 1966-05-01 0.004336700 1966-06-01 0.003775920 1966-07-01 0.004934865 1966-08-01 0.004112388 1966-09-01 0.004336700 1966-10-01 0.006318123 1966-11-01 0.008075234 1966-12-01 0.015514918 1967-01-01 0.026618365 1967-02-01 0.011140833 1967-03-01 0.007888308 1967-04-01 0.006093811 1967-05-01 0.006280738 1967-06-01 0.005121792 1967-07-01 0.004486241 1967-08-01 0.004112388 1967-09-01 0.005121792 1967-10-01 0.007589225 1967-11-01 0.008561244 1967-12-01 0.021795655 1968-01-01 0.047404616 1968-02-01 0.018430975 1968-03-01 0.010318355 1968-04-01 0.007888308 1968-05-01 0.005832114 1968-06-01 0.005159177 1968-07-01 0.004561012 1968-08-01 0.004486241 1968-09-01 0.004785324 1968-10-01 0.005645187 1968-11-01 0.008112620 1968-12-01 0.013159641 1969-01-01 0.020375012 1969-02-01 0.015776615 1969-03-01 0.006654591 1969-04-01 0.005009636 1969-05-01 0.003551608 1969-06-01 0.003439452 1969-07-01 0.002243121 1969-08-01 0.002317891 1969-09-01 0.003215140 1969-10-01 0.003775920 1969-11-01 0.004523627 1969-12-01 0.007402298 1970-01-01 0.011701613 1970-02-01 0.009234180 1970-03-01 0.004860095 1970-04-01 0.003102984 1970-05-01 0.002205735 1970-06-01 0.001345872 1970-07-01 0.000972019 1970-08-01 0.001271102 1970-09-01 0.001682341 1970-10-01 0.002205735 1970-11-01 0.002766515 1970-12-01 0.005346104 1971-01-01 0.006642684 1971-02-01 0.004639865 1971-03-01 0.002803947 1971-04-01 0.001969439 1971-05-01 0.001535495 1971-06-01 0.001468734 1971-07-01 0.001769157 1971-08-01 0.001702396 1971-09-01 0.002236482 1971-10-01 0.003371413 1971-11-01 0.004506343 1971-12-01 0.007377051 1972-01-01 0.008378461 1972-02-01 0.005841556 1972-03-01 0.004372822 1972-04-01 0.003638455 1972-05-01 0.002536904 1972-06-01 0.002169721 1972-07-01 0.002102960 1972-08-01 0.002637045 1972-09-01 0.002169721 1972-10-01 0.002870708 1972-11-01 0.002737186 1972-12-01 0.003004229 1973-01-01 0.005307471 1973-02-01 0.003805357 1973-03-01 0.003204511 1973-04-01 0.002937468 1973-05-01 0.001735777 1973-06-01 0.001835918 1973-07-01 0.001702396 1973-08-01 0.001869298 1973-09-01 0.001535495 1973-10-01 0.001669016 1973-11-01 0.002670426 1973-12-01 0.004172540 1974-01-01 0.004472963 1974-02-01 0.003705216 1974-03-01 0.002703806 1974-04-01 0.002136341 1974-05-01 0.002136341 1974-06-01 0.002069580 1974-07-01 0.002303242 1974-08-01 0.002470144 1974-09-01 0.003070990 1974-10-01 0.008311700 1974-11-01 0.020629039 1974-12-01 0.034381731 1975-01-01 0.071066705 1975-02-01 0.092163068 1975-03-01 0.133788329 1975-04-01 0.188966001 1975-05-01 0.217873360 1975-06-01 0.251387203 1975-07-01 0.284634003 1975-08-01 0.337608574 1975-09-01 0.415551625 1975-10-01 0.525940349 1975-11-01 0.678154616 1975-12-01 0.876500487 1976-01-01 1.054117179 1976-02-01 1.075380444 1976-03-01 0.933781119 1976-04-01 0.865752024 1976-05-01 0.763074154 1976-06-01 0.656991492 1976-07-01 0.514791321 1976-08-01 0.470362113 1976-09-01 0.433643759 1976-10-01 0.433476858 1976-11-01 0.510451879 1976-12-01 0.580850978 1977-01-01 0.700219008 1977-02-01 0.585424082 1977-03-01 0.469594366 1977-04-01 0.459980833 1977-05-01 0.409977111 1977-06-01 0.339878436 1977-07-01 0.291944294 1977-08-01 0.275754838 1977-09-01 0.258764254 1977-10-01 0.285134708 1977-11-01 0.352195774 1977-12-01 0.386076801 1978-01-01 0.503942717 1978-02-01 0.482078606 1978-03-01 0.373158616 1978-04-01 0.337708715 1978-05-01 0.312773614 1978-06-01 0.281663155 1978-07-01 0.254591714 1978-08-01 0.261701722 1978-09-01 0.270046803 1978-10-01 0.309268681 1978-11-01 0.378399327 1978-12-01 0.433844041 1979-01-01 0.572572658 1979-02-01 0.475302401 1979-03-01 0.402566680 1979-04-01 0.371990305 1979-05-01 0.352396056 1979-06-01 0.311304880 1979-07-01 0.285635413 1979-08-01 0.270881311 1979-09-01 0.257161998 1979-10-01 0.260399890 1979-11-01 0.281529633 1979-12-01 0.297185004 1980-01-01 0.379567638 1980-02-01 0.288539501 1980-03-01 0.240705500 1980-04-01 0.215069413 1980-05-01 0.190434735 1980-06-01 0.167936399 1980-07-01 0.157354837 1980-08-01 0.156320047 1980-09-01 0.154717791 1980-10-01 0.160225544 1980-11-01 0.184993743 1980-12-01 0.209795322 1981-01-01 0.285118773 1981-02-01 0.211049347 1981-03-01 0.171912227 1981-04-01 0.162273498 1981-05-01 0.151599738 1981-06-01 0.144580932 1981-07-01 0.139923291 1981-08-01 0.150208915 1981-09-01 0.159168404 1981-10-01 0.184753084 1981-11-01 0.229388808 1981-12-01 0.295921912 1982-01-01 0.379241930 1982-02-01 0.313485099 1982-03-01 0.305495951 1982-04-01 0.316169712 1982-05-01 0.339651984 1982-06-01 0.342627699 1982-07-01 0.349937607 1982-08-01 0.399036903 1982-09-01 0.441117394 1982-10-01 0.523499415 1982-11-01 0.658182860 1982-12-01 0.762656330 1983-01-01 0.901253488 1983-02-01 0.900089077 1983-03-01 0.836693411 1983-04-01 0.838440027 1983-05-01 0.852445294 1983-06-01 0.812143763 1983-07-01 0.758031034 1983-08-01 0.771680509 1983-09-01 0.791734240 1983-10-01 0.821200287 1983-11-01 0.936929722 1983-12-01 0.982632822 1984-01-01 1.190447696 1984-02-01 1.196108024 1984-03-01 1.175278019 1984-04-01 1.183784682 1984-05-01 1.150340234 1984-06-01 1.115860755 1984-07-01 1.082060514 1984-08-01 1.063688709 1984-09-01 1.042599947 1984-10-01 1.069154968 1984-11-01 1.163730951 1984-12-01 1.223406974 1985-01-01 1.289681320 1985-02-01 1.214415139 1985-03-01 1.117089854 1985-04-01 1.057381487 1985-05-01 0.972994093 1985-06-01 0.887345255 1985-07-01 0.866256492 1985-08-01 0.842192015 1985-09-01 0.823496763 1985-10-01 0.831421221 1985-11-01 0.903905755 1985-12-01 0.971764994 1986-01-01 1.025004415 1986-02-01 0.984735229 1986-03-01 0.916099718 1986-04-01 0.868100142 1986-05-01 0.816833749 1986-06-01 0.753793875 1986-07-01 0.741955705 1986-08-01 0.731184910 1986-09-01 0.726591959 1986-10-01 0.744090457 1986-11-01 0.805221992 1986-12-01 0.867000421 1987-01-01 0.956789385 1987-02-01 0.919851706 1987-03-01 0.858202655 1987-04-01 0.819033190 1987-05-01 0.787044255 1987-06-01 0.754570148 1987-07-01 0.742440876 1987-08-01 0.720317082 1987-09-01 0.712619037 1987-10-01 0.724618931 1987-11-01 0.765826114 1987-12-01 0.815184168 1988-01-01 0.877286045 1988-02-01 0.846752622 1988-03-01 0.807227365 1988-04-01 0.772165680 1988-05-01 0.730085190 1988-06-01 0.690592277 1988-07-01 0.678042523 1988-08-01 0.652037362 1988-09-01 0.627196611 1988-10-01 0.624770757 1988-11-01 0.650129023 1988-12-01 0.679368657 1989-01-01 0.700295696 1989-02-01 0.670441512 1989-03-01 0.618463535 1989-04-01 0.595045952 1989-05-01 0.557137932 1989-06-01 0.524275688 1989-07-01 0.516124817 1989-08-01 0.505451057 1989-09-01 0.492351442 1989-10-01 0.500243556 1989-11-01 0.531391528 1989-12-01 0.562539501 1990-01-01 0.515252991 1990-02-01 0.500563821 1990-03-01 0.474995831 1990-04-01 0.459285046 1990-05-01 0.441199697 1990-06-01 0.432391717 1990-07-01 0.443795151 1990-08-01 0.455115752 1990-09-01 0.469169863 1990-10-01 0.515501492 1990-11-01 0.606480464 1990-12-01 0.694173701 1991-01-01 0.796197162 1991-02-01 0.853076277 1991-03-01 0.891014094 1991-04-01 0.929393691 1991-05-01 0.967690454 1991-06-01 0.973378365 1991-07-01 1.036525227 1991-08-01 1.090339497 1991-09-01 1.148792451 1991-10-01 1.261611899 1991-11-01 1.430261235 1991-12-01 1.617465312 1992-01-01 1.860941057 1992-02-01 2.000764279 1992-03-01 2.093013367 1992-04-01 2.190039197 1992-05-01 2.267461060 1992-06-01 2.338780843 1992-07-01 2.489344830 1992-08-01 2.618951900 1992-09-01 2.818581026 1992-10-01 3.011638682 1992-11-01 3.315555389 1992-12-01 3.579601493 1993-01-01 3.907374294 1993-02-01 4.071799114 1993-03-01 4.169791337 1993-04-01 4.284764460 1993-05-01 4.346696428 1993-06-01 4.429806202 1993-07-01 4.563858679 1993-08-01 4.666544809 1993-09-01 4.751035145 1993-10-01 4.791319916 1993-11-01 4.978109824 1993-12-01 5.091177773 1994-01-01 5.195520576 1994-02-01 5.173845768 1994-03-01 5.028969693 1994-04-01 4.900991685 1994-05-01 4.777210582 1994-06-01 4.644897612 1994-07-01 4.577747123 1994-08-01 4.533403503 1994-09-01 4.442866310 1994-10-01 4.391371383 1994-11-01 4.465148565 1994-12-01 4.538677246 1995-01-01 4.633577012 1995-02-01 4.565542964 1995-03-01 4.439166406 1995-04-01 4.326236513 1995-05-01 4.195773495 1995-06-01 4.040681268 1995-07-01 4.034109798 1995-08-01 4.023672756 1995-09-01 3.961050508 1995-10-01 4.041288715 1995-11-01 4.199721900 1995-12-01 4.338136949 1996-01-01 4.546353165 1996-02-01 4.586278990 1996-03-01 4.564272848 1996-04-01 4.532409499 1996-05-01 4.483427193 1996-06-01 4.416801317 1996-07-01 4.461586718 1996-08-01 4.520094894 1996-09-01 4.594755635 1996-10-01 4.807306813 1996-11-01 5.053571291 1996-12-01 5.306075904 1997-01-01 5.674133477 1997-02-01 5.695946342 1997-03-01 5.583182116 1997-04-01 5.459621903 1997-05-01 5.303867007 1997-06-01 5.116911431 1997-07-01 5.038412730 1997-08-01 4.993295996 1997-09-01 4.893509044 1997-10-01 4.790105022 1997-11-01 4.857559234 1997-12-01 4.985178297 1998-01-01 5.038826899 1998-02-01 4.874705802 1998-03-01 4.574709889 1998-04-01 4.249284041 1998-05-01 3.930733387 1998-06-01 3.610967840 1998-07-01 3.478848148 1998-08-01 3.374781457 1998-09-01 3.245533333 1998-10-01 3.189454944 1998-11-01 3.274028113 1998-12-01 3.432323241 1999-01-01 3.475783303 1999-02-01 3.369286824 1999-03-01 3.149694786 1999-04-01 2.924359613 1999-05-01 2.722411144 1999-06-01 2.551249187 1999-07-01 2.488378437 1999-08-01 2.415622871 1999-09-01 2.349604442 1999-10-01 2.326604295 1999-11-01 2.383621466 1999-12-01 2.513753149 2000-01-01 2.346878177 2000-02-01 2.247333916 2000-03-01 2.066081782 2000-04-01 1.916448695 2000-05-01 1.768133068 2000-06-01 1.671198392 2000-07-01 1.650372385 2000-08-01 1.614091555 2000-09-01 1.579153522 2000-10-01 1.594963045 2000-11-01 1.665092471 2000-12-01 1.766511578 2001-01-01 1.831649856 2001-02-01 1.767575681 2001-03-01 1.662660236 2001-04-01 1.596964572 2001-05-01 1.547939847 2001-06-01 1.499269823 2001-07-01 1.524352240 2001-08-01 1.547483803 2001-09-01 1.575125133 2001-10-01 1.730382763 2001-11-01 1.966892223 2001-12-01 2.179560718 2002-01-01 2.374316821 2002-02-01 2.393521338 2002-03-01 2.340290875 2002-04-01 2.331524697 2002-05-01 2.303782023 2002-06-01 2.298081474 2002-07-01 2.354909617 2002-08-01 2.441405953 2002-09-01 2.581436782 2002-10-01 2.791926401 2002-11-01 3.056178534 2002-12-01 3.288811620 2003-01-01 3.520253925 2003-02-01 3.598262777 2003-03-01 3.592815585 2003-04-01 3.588153802 2003-05-01 3.562437991 2003-06-01 3.559296355 2003-07-01 3.590053986 2003-08-01 3.640041470 2003-09-01 3.716454167 2003-10-01 3.832263995 2003-11-01 3.967531698 2003-12-01 4.125550926 2004-01-01 4.260539936 2004-02-01 4.205206603 2004-03-01 4.075234077 2004-04-01 3.928590611 2004-05-01 3.770368696 2004-06-01 3.650961189 2004-07-01 3.626182801 2004-08-01 3.697072299 2004-09-01 3.707662653 2004-10-01 3.747439820 2004-11-01 3.861400136 2004-12-01 4.013592137 2005-01-01 4.105206299 2005-02-01 4.065150439 2005-03-01 3.944298792 2005-04-01 3.817366559 2005-05-01 3.683061616 2005-06-01 3.563755451 2005-07-01 3.544525598 2005-08-01 3.606775597 2005-09-01 3.616124498 2005-10-01 3.650023765 2005-11-01 3.718329014 2005-12-01 3.845058561 2006-01-01 3.906877852 2006-02-01 3.802874496 2006-03-01 3.629324437 2006-04-01 3.454786283 2006-05-01 3.280628165 2006-06-01 3.112170597 2006-07-01 3.083997215 2006-08-01 3.118175176 2006-09-01 3.087822917 2006-10-01 3.110346421 2006-11-01 3.145005761 2006-12-01 3.257673953 2007-01-01 3.320430668 2007-02-01 3.202315285 2007-03-01 2.987467912 2007-04-01 2.858610161 2007-05-01 2.690659308 2007-06-01 2.528028968 2007-07-01 2.527978296 2007-08-01 2.552756684 2007-09-01 2.525495390 2007-10-01 2.585237148 2007-11-01 2.655695938 2007-12-01 2.761903507 2008-01-01 2.834490503 2008-02-01 2.747842152 2008-03-01 2.629270725 2008-04-01 2.555872985 2008-05-01 2.411104366 2008-06-01 2.317640692 2008-07-01 2.335021034 2008-08-01 2.382550948 2008-09-01 2.431727687 2008-10-01 2.545510653 2008-11-01 2.727446853 2008-12-01 3.008927314 2009-01-01 3.253873587 2009-02-01 3.354507285 2009-03-01 3.413058261 2009-04-01 3.463628468 2009-05-01 3.423572608 2009-06-01 3.553418455 2009-07-01 3.682909601 2009-08-01 3.821420283 2009-09-01 3.912071686 2009-10-01 4.006548791 2009-11-01 4.153800316 2009-12-01 4.376501778 2010-01-01 4.065905770 2010-02-01 4.001920930 2010-03-01 3.840755940 2010-04-01 3.668140290 2010-05-01 3.494738140 2010-06-01 3.342039680 2010-07-01 3.292466470 2010-08-01 3.305166280 2010-09-01 3.239492760 2010-10-01 3.223878240 2010-11-01 3.277152670 2010-12-01 3.438340800 2011-01-01 3.441764430 2011-02-01 3.315483430 2011-03-01 3.120706730 2011-04-01 2.855676250 2011-05-01 2.652941930 2011-06-01 2.553332840 2011-07-01 2.526082610 2011-08-01 2.583613450 2011-09-01 2.575678960 2011-10-01 2.664369440 2011-11-01 2.801569040 2011-12-01 3.022555000 2012-01-01 3.107104750 2012-02-01 3.080201500 2012-03-01 2.923778700 2012-04-01 2.848967790 2012-05-01 2.749543770 2012-06-01 2.657198330 2012-07-01 2.690185450 2012-08-01 2.771820480 2012-09-01 2.783941980 2012-10-01 2.903977170 2012-11-01 3.055056340 2012-12-01 3.291980680 2013-01-01 3.427283400 2013-02-01 3.377386330 2013-03-01 3.215272900 2013-04-01 3.142590190 2013-05-01 3.037082290 2013-06-01 2.926230750 2013-07-01 2.972912390 2013-08-01 3.006223370 2013-09-01 3.032039380 2013-10-01 3.086886830 2013-11-01 3.217123510 2013-12-01 3.456870030 2014-01-01 3.410894880 2014-02-01 3.321850180 2014-03-01 3.179124950 2014-04-01 3.050954890 2014-05-01 2.900128620 2014-06-01 2.818272480 2014-07-01 2.827664350 2014-08-01 2.858377090 2014-09-01 2.892450430 2014-10-01 2.946576070 2014-11-01 3.039048140 2014-12-01 3.279787080 2015-01-01 3.359395400 2015-02-01 3.336583390 2015-03-01 3.229467140 2015-04-01 3.140956580 2015-05-01 3.034530250 2015-06-01 2.965693640 2015-07-01 2.976776940 2015-08-01 3.048640300 2015-09-01 3.076304030 2015-10-01 3.144027850 2015-11-01 3.297012920 2015-12-01 3.530385250 2016-01-01 3.641997140 2016-02-01 3.592433890 2016-03-01 3.456830460 2016-04-01 3.328104010 2016-05-01 3.222122790 2016-06-01 3.096356470 2016-07-01 3.100429250 2016-08-01 3.179392160 2016-09-01 3.175319380 2016-10-01 3.216625800 2016-11-01 3.321160400 2016-12-01 3.546921330 2017-01-01 3.660291410 2017-02-01 3.556647030 2017-03-01 3.389084530 2017-04-01 3.256596870 2017-05-01 3.110844870 2017-06-01 2.973416470 2017-07-01 2.980605030 2017-08-01 3.017371300 2017-09-01 2.963757540 2017-10-01 3.000056440 2017-11-01 3.056073810 2017-12-01 3.263874460 2018-01-01 3.319669280 2018-02-01 3.203250170 2018-03-01 2.902421070 2018-04-01 2.665799410 2018-05-01 2.434585860 2018-06-01 2.371980830 2018-07-01 2.360252120 2018-08-01 2.401224700 2018-09-01 2.372136610