Month	Percent
1960-01-01	4.560
1960-02-01	4.600
1960-03-01	4.510
1960-04-01	4.490
1960-05-01	4.560
1960-06-01	4.490
1960-07-01	4.390
1960-08-01	4.400
1960-09-01	4.410
1960-10-01	4.350
1960-11-01	4.360
1960-12-01	4.340
1961-01-01	4.340
1961-02-01	4.300
1961-03-01	4.260
1961-04-01	4.120
1961-05-01	4.050
1961-06-01	4.090
1961-07-01	4.140
1961-08-01	4.230
1961-09-01	4.150
1961-10-01	4.140
1961-11-01	4.180
1961-12-01	4.150
1962-01-01	4.080
1962-02-01	4.020
1962-03-01	4.150
1962-04-01	4.220
1962-05-01	4.290
1962-06-01	4.450
1962-07-01	4.440
1962-08-01	4.260
1962-09-01	4.200
1962-10-01	4.250
1962-11-01	4.260
1962-12-01	4.210
1963-01-01	4.220
1963-02-01	4.250
1963-03-01	4.200
1963-04-01	4.160
1963-05-01	4.200
1963-06-01	4.250
1963-07-01	4.270
1963-08-01	4.230
1963-09-01	4.230
1963-10-01	4.410
1963-11-01	4.590
1963-12-01	4.700
1964-01-01	4.830
1964-02-01	4.820
1964-03-01	4.880
1964-04-01	4.900
1964-05-01	4.930
1964-06-01	5.010
1964-07-01	5.320
1964-08-01	5.380
1964-09-01	5.130
1964-10-01	5.200
1964-11-01	5.320
1964-12-01	5.350
1965-01-01	5.160
1965-02-01	5.070
1965-03-01	5.120
1965-04-01	5.210
1965-05-01	5.390
1965-06-01	5.480
1965-07-01	5.640
1965-08-01	5.560
1965-09-01	5.540
1965-10-01	5.760
1965-11-01	5.990
1965-12-01	6.090
1966-01-01	6.170
1966-02-01	6.310
1966-03-01	6.440
1966-04-01	6.500
1966-05-01	6.770
1966-06-01	6.730
1966-07-01	6.590
1966-08-01	6.790
1966-09-01	6.650
1966-10-01	6.650
1966-11-01	6.730
1966-12-01	6.670
1967-01-01	6.450
1967-02-01	6.530
1967-03-01	6.420
1967-04-01	6.330
1967-05-01	6.380
1967-06-01	6.490
1967-07-01	6.440
1967-08-01	6.410
1967-09-01	6.380
1967-10-01	6.380
1967-11-01	6.490
1967-12-01	6.390
1968-01-01	6.440
1968-02-01	6.480
1968-03-01	6.510
1968-04-01	6.450
1968-05-01	6.470
1968-06-01	6.530
1968-07-01	6.590
1968-08-01	6.580
1968-09-01	6.510
1968-10-01	6.520
1968-11-01	6.550
1968-12-01	6.600
1969-01-01	6.720
1969-02-01	6.930
1969-03-01	7.090
1969-04-01	7.270
1969-05-01	7.280
1969-06-01	7.530
1969-07-01	7.640
1969-08-01	7.700
1969-09-01	7.920
1969-10-01	7.940
1969-11-01	7.760
1969-12-01	7.900
1970-01-01	7.930
1970-02-01	8.010
1970-03-01	8.030
1970-04-01	8.060
1970-05-01	8.150
1970-06-01	8.170
1970-07-01	8.020
1970-08-01	8.010
1970-09-01	8.020
1970-10-01	8.010
1970-11-01	7.950
1970-12-01	7.770
1971-01-01	7.550
1971-02-01	7.570
1971-03-01	7.560
1971-04-01	7.380
1971-05-01	7.550
1971-06-01	7.560
1971-07-01	7.610
1971-08-01	7.590
1971-09-01	7.850
1971-10-01	7.740
1971-11-01	7.760
1971-12-01	7.790
1972-01-01	7.520
1972-02-01	7.320
1972-03-01	7.260
1972-04-01	7.360
1972-05-01	7.510
1972-06-01	7.560
1972-07-01	7.470
1972-08-01	7.230
1972-09-01	7.050
1972-10-01	7.150
1972-11-01	7.320
1972-12-01	7.500
1973-01-01	7.460
1973-02-01	7.400
1973-03-01	7.280
1973-04-01	7.410
1973-05-01	7.450
1973-06-01	7.800
1973-07-01	8.000
1973-08-01	8.440
1973-09-01	8.420
1973-10-01	8.240
1973-11-01	8.090
1973-12-01	9.010
1974-01-01	9.260
1974-02-01	9.350
1974-03-01	9.340
1974-04-01	9.770
1974-05-01	10.220
1974-06-01	10.150
1974-07-01	10.440
1974-08-01	10.450
1974-09-01	10.430
1974-10-01	10.250
1974-11-01	9.140
1974-12-01	9.090
1975-01-01	8.950
1975-02-01	8.800
1975-03-01	8.820
1975-04-01	8.890
1975-05-01	8.540
1975-06-01	8.330
1975-07-01	8.750
1975-08-01	8.940
1975-09-01	8.970
1975-10-01	8.970
1975-11-01	8.870
1975-12-01	8.610
1976-01-01	8.470
1976-02-01	8.250
1976-03-01	8.320
1976-04-01	8.400
1976-05-01	8.690
1976-06-01	9.340
1976-07-01	9.630
1976-08-01	10.030
1976-09-01	9.800
1976-10-01	9.320
1976-11-01	8.780
1976-12-01	8.400
1977-01-01	8.400
1977-02-01	8.380
1977-03-01	8.290
1977-04-01	8.110
1977-05-01	8.120
1977-06-01	8.170
1977-07-01	7.930
1977-08-01	7.700
1977-09-01	7.830
1977-10-01	8.030
1977-11-01	8.140
1977-12-01	8.110
1978-01-01	7.730
1978-02-01	7.540
1978-03-01	7.460
1978-04-01	7.270
1978-05-01	7.400
1978-06-01	7.350
1978-07-01	7.700
1978-08-01	7.780
1978-09-01	7.780
1978-10-01	8.280
1978-11-01	8.060
1978-12-01	8.480
1979-01-01	8.270
1979-02-01	8.370
1979-03-01	8.520
1979-04-01	8.580
1979-05-01	8.770
1979-06-01	9.010
1979-07-01	8.980
1979-08-01	8.730
1979-09-01	8.770
1979-10-01	8.830
1979-11-01	9.180
1979-12-01	9.290
1980-01-01	9.410
1980-02-01	10.370
1980-03-01	11.450
1980-04-01	10.590
1980-05-01	9.970
1980-06-01	9.990
1980-07-01	9.660
1980-08-01	9.670
1980-09-01	10.250
1980-10-01	10.200
1980-11-01	10.460
1980-12-01	10.480
1981-01-01	10.430
1981-02-01	10.960
1981-03-01	11.380
1981-04-01	11.290
1981-05-01	11.900
1981-06-01	11.430
1981-07-01	11.570
1981-08-01	12.120
1981-09-01	12.300
1981-10-01	12.100
1981-11-01	11.870
1981-12-01	11.280
1982-01-01	11.230
1982-02-01	10.980
1982-03-01	10.370
1982-04-01	10.170
1982-05-01	10.150
1982-06-01	10.530
1982-07-01	10.500
1982-08-01	10.240
1982-09-01	9.980
1982-10-01	9.730
1982-11-01	8.890
1982-12-01	8.400
1983-01-01	7.980
1983-02-01	8.200
1983-03-01	8.030
1983-04-01	8.460
1983-05-01	8.850
1983-06-01	9.220
1983-07-01	9.080
1983-08-01	9.030
1983-09-01	8.800
1983-10-01	8.530
1983-11-01	8.570
1983-12-01	8.580
1984-01-01	8.570
1984-02-01	8.560
1984-03-01	8.400
1984-04-01	8.450
1984-05-01	8.520
1984-06-01	8.680
1984-07-01	8.690
1984-08-01	8.500
1984-09-01	8.260
1984-10-01	7.940
1984-11-01	7.650
1984-12-01	7.720
1985-01-01	7.380
1985-02-01	7.890
1985-03-01	8.020
1985-04-01	7.700
1985-05-01	7.540
1985-06-01	7.350
1985-07-01	7.240
1985-08-01	6.920
1985-09-01	6.890
1985-10-01	7.030
1985-11-01	7.010
1985-12-01	6.960
1986-01-01	6.810
1986-02-01	6.840
1986-03-01	6.440
1986-04-01	6.150
1986-05-01	6.330
1986-06-01	6.290
1986-07-01	6.240
1986-08-01	6.010
1986-09-01	6.030
1986-10-01	6.180
1986-11-01	6.220
1986-12-01	6.270
1987-01-01	6.160
1987-02-01	6.180
1987-03-01	6.200
1987-04-01	6.120
1987-05-01	6.060
1987-06-01	6.280
1987-07-01	6.450
1987-08-01	6.600
1987-09-01	6.870
1987-10-01	7.080
1987-11-01	6.410
1987-12-01	6.420
1988-01-01	6.370
1988-02-01	6.200
1988-03-01	6.130
1988-04-01	6.190
1988-05-01	6.470
1988-06-01	6.520
1988-07-01	6.680
1988-08-01	6.720
1988-09-01	6.580
1988-10-01	6.280
1988-11-01	6.350
1988-12-01	6.500
1989-01-01	6.670
1989-02-01	6.970
1989-03-01	7.090
1989-04-01	7.080
1989-05-01	7.380
1989-06-01	7.200
1989-07-01	7.050
1989-08-01	7.050
1989-09-01	7.230
1989-10-01	7.430
1989-11-01	7.720
1989-12-01	7.750
1990-01-01	8.220
1990-02-01	8.780
1990-03-01	8.980
1990-04-01	8.890
1990-05-01	8.950
1990-06-01	8.960
1990-07-01	8.740
1990-08-01	8.990
1990-09-01	9.160
1990-10-01	9.190
1990-11-01	9.130
1990-12-01	9.060
1991-01-01	9.150
1991-02-01	8.640
1991-03-01	8.660
1991-04-01	8.570
1991-05-01	8.590
1991-06-01	8.640
1991-07-01	8.820
1991-08-01	8.840
1991-09-01	8.770
1991-10-01	8.720
1991-11-01	8.750
1991-12-01	8.720
1992-01-01	8.390
1992-02-01	8.300
1992-03-01	8.310
1992-04-01	8.310
1992-05-01	8.320
1992-06-01	8.300
1992-07-01	8.340
1992-08-01	8.360
1992-09-01	8.040
1992-10-01	7.650
1992-11-01	7.510
1992-12-01	7.400
1993-01-01	7.130
1993-02-01	6.870
1993-03-01	6.560
1993-04-01	6.600
1993-05-01	6.670
1993-06-01	6.590
1993-07-01	6.430
1993-08-01	6.180
1993-09-01	5.980
1993-10-01	5.830
1993-11-01	5.810
1993-12-01	5.680
1994-01-01	5.610
1994-02-01	5.870
1994-03-01	6.290
1994-04-01	6.540
1994-05-01	6.750
1994-06-01	7.110
1994-07-01	6.910
1994-08-01	7.120
1994-09-01	7.490
1994-10-01	7.550
1994-11-01	7.540
1994-12-01	7.600
1995-01-01	7.710
1995-02-01	7.540
1995-03-01	7.420
1995-04-01	7.170
1995-05-01	6.920
1995-06-01	6.830
1995-07-01	6.850
1995-08-01	6.740
1995-09-01	6.580
1995-10-01	6.590
1995-11-01	6.350
1995-12-01	6.090
1996-01-01	5.870
1996-02-01	6.210
1996-03-01	6.450
1996-04-01	6.350
1996-05-01	6.350
1996-06-01	6.470
1996-07-01	6.410
1996-08-01	6.240
1996-09-01	6.100
1996-10-01	5.880
1996-11-01	5.760
1996-12-01	5.720
1997-01-01	5.660
1997-02-01	5.470
1997-03-01	5.650
1997-04-01	5.790
1997-05-01	5.690
1997-06-01	5.620
1997-07-01	5.490
1997-08-01	5.600
1997-09-01	5.550
1997-10-01	5.570
1997-11-01	5.540
1997-12-01	5.290
1998-01-01	5.070
1998-02-01	5.010
1998-03-01	4.940
1998-04-01	4.950
1998-05-01	5.000
1998-06-01	4.850
1998-07-01	4.760
1998-08-01	4.530
1998-09-01	4.190
1998-10-01	4.140
1998-11-01	4.190
1998-12-01	3.950
1999-01-01	3.801
1999-02-01	3.932
1999-03-01	4.139
1999-04-01	3.995
1999-05-01	4.193
1999-06-01	4.513
1999-07-01	4.821
1999-08-01	5.030
1999-09-01	5.215
1999-10-01	5.450
1999-11-01	5.178
1999-12-01	5.284
2000-01-01	5.666
2000-02-01	5.655
2000-03-01	5.479
2000-04-01	5.387
2000-05-01	5.501
2000-06-01	5.310
2000-07-01	5.401
2000-08-01	5.361
2000-09-01	5.414
2000-10-01	5.348
2000-11-01	5.296
2000-12-01	5.028
2001-01-01	4.930
2001-02-01	4.916
2001-03-01	4.826
2001-04-01	5.022
2001-05-01	5.221
2001-06-01	5.170
2001-07-01	5.172
2001-08-01	4.979
2001-09-01	4.979
2001-10-01	4.765
2001-11-01	4.620
2001-12-01	4.890
2002-01-01	4.969
2002-02-01	5.025
2002-03-01	5.272
2002-04-01	5.253
2002-05-01	5.303
2002-06-01	5.162
2002-07-01	4.993
2002-08-01	4.711
2002-09-01	4.497
2002-10-01	4.580
2002-11-01	4.555
2002-12-01	4.363
2003-01-01	4.189
2003-02-01	3.971
2003-03-01	4.013
2003-04-01	4.232
2003-05-01	3.913
2003-06-01	3.722
2003-07-01	4.036
2003-08-01	4.185
2003-09-01	4.212
2003-10-01	4.270
2003-11-01	4.409
2003-12-01	4.326
2004-01-01	4.181
2004-02-01	4.122
2004-03-01	3.934
2004-04-01	4.127
2004-05-01	4.371
2004-06-01	4.422
2004-07-01	4.306
2004-08-01	4.146
2004-09-01	4.090
2004-10-01	3.964
2004-11-01	3.845
2004-12-01	3.632
2005-01-01	3.558
2005-02-01	3.547
2005-03-01	3.689
2005-04-01	3.477
2005-05-01	3.304
2005-06-01	3.134
2005-07-01	3.269
2005-08-01	3.284
2005-09-01	3.116
2005-10-01	3.279
2005-11-01	3.478
2005-12-01	3.353
2006-01-01	3.327
2006-02-01	3.476
2006-03-01	3.656
2006-04-01	3.921
2006-05-01	3.964
2006-06-01	3.973
2006-07-01	3.989
2006-08-01	3.903
2006-09-01	3.778
2006-10-01	3.820
2006-11-01	3.749
2006-12-01	3.813
2007-01-01	4.052
2007-02-01	4.074
2007-03-01	3.978
2007-04-01	4.194
2007-05-01	4.324
2007-06-01	4.614
2007-07-01	4.573
2007-08-01	4.383
2007-09-01	4.343
2007-10-01	4.376
2007-11-01	4.209
2007-12-01	4.338
2008-01-01	4.128
2008-02-01	4.046
2008-03-01	3.974
2008-04-01	4.210
2008-05-01	4.353
2008-06-01	4.734
2008-07-01	4.687
2008-08-01	4.398
2008-09-01	4.353
2008-10-01	4.228
2008-11-01	3.963
2008-12-01	3.647
2009-01-01	3.763
2009-02-01	3.797
2009-03-01	3.658
2009-04-01	3.771
2009-05-01	3.853
2009-06-01	3.956
2009-07-01	3.764
2009-08-01	3.609
2009-09-01	3.580
2009-10-01	3.533
2009-11-01	3.520
2009-12-01	3.438
2010-01-01	3.467
2010-02-01	3.356
2010-03-01	3.368
2010-04-01	3.321
2010-05-01	3.018
2010-06-01	2.899
2010-07-01	2.853
2010-08-01	2.558
2010-09-01	2.524
2010-10-01	2.577
2010-11-01	2.785
2010-12-01	3.155
2011-01-01	3.228
2011-02-01	3.408
2011-03-01	3.423
2011-04-01	3.647
2011-05-01	3.403
2011-06-01	3.284
2011-07-01	3.172
2011-08-01	2.678
2011-09-01	2.336
2011-10-01	2.464
2011-11-01	2.446
2011-12-01	2.376
2012-01-01	2.197
2012-02-01	2.236
2012-03-01	2.249
2012-04-01	2.293
2012-05-01	1.974
2012-06-01	1.926
2012-07-01	1.747
2012-08-01	1.757
2012-09-01	1.844
2012-10-01	1.767
2012-11-01	1.650
2012-12-01	1.562
2013-01-01	1.727
2013-02-01	1.827
2013-03-01	1.665
2013-04-01	1.661
2013-05-01	1.686
2013-06-01	2.000
2013-07-01	2.032
2013-08-01	2.196
2013-09-01	2.322
2013-10-01	2.177
2013-11-01	2.056
2013-12-01	2.158
2014-01-01	2.098
2014-02-01	1.891
2014-03-01	1.810
2014-04-01	1.846
2014-05-01	1.709
2014-06-01	1.598
2014-07-01	1.407
2014-08-01	1.200
2014-09-01	1.154
2014-10-01	1.032
2014-11-01	0.934
2014-12-01	0.777
2015-01-01	0.520
2015-02-01	0.416
2015-03-01	0.326
2015-04-01	0.314
2015-05-01	0.754
2015-06-01	1.054
2015-07-01	0.986
2015-08-01	0.853
2015-09-01	0.866
2015-10-01	0.725
2015-11-01	0.716
2015-12-01	0.754
2016-01-01	0.646
2016-02-01	0.371
2016-03-01	0.320
2016-04-01	0.395
2016-05-01	0.384
2016-06-01	0.250
2016-07-01	0.062
2016-08-01	0.027
2016-09-01	0.061
2016-10-01	0.156
2016-11-01	0.385
2016-12-01	0.436
2017-01-01	0.481
2017-02-01	0.486
2017-03-01	0.485
2017-04-01	0.498
2017-05-01	0.589
2017-06-01	0.503
2017-07-01	0.688
2017-08-01	0.542
2017-09-01	0.532
2017-10-01	0.541
2017-11-01	0.468
2017-12-01	0.452
2018-01-01	0.610
2018-02-01	0.760
2018-03-01	0.630
2018-04-01	0.690
2018-05-01	0.670
2018-06-01	0.570
2018-07-01	0.470
2018-08-01	0.470
2018-09-01	0.550
2018-10-01	0.580