Quarter	Percent
1967-10-01	2.20402589651672
1968-01-01	2.29218693237738
1968-04-01	2.46850900409872
1968-07-01	2.38034796823805
1968-10-01	2.20402589651672
1969-01-01	2.20402589651672
1969-04-01	1.93954278893471
1969-07-01	1.85138175307404
1969-10-01	1.93954278893471
1970-01-01	2.11586486065605
1970-04-01	2.20402589651672
1970-07-01	2.29218693237738
1970-10-01	2.29218693237738
1971-01-01	2.38034796823805
1971-04-01	2.38034796823805
1971-07-01	2.38034796823805
1971-10-01	2.46850900409872
1972-01-01	2.46850900409872
1972-04-01	2.46850900409872
1972-07-01	2.46850900409872
1972-10-01	2.38034796823805
1973-01-01	2.29218693237738
1973-04-01	2.29218693237738
1973-07-01	2.46850900409872
1973-10-01	2.38034796823805
1974-01-01	2.38034796823805
1974-04-01	2.29218693237738
1974-07-01	2.55667003995939
1974-10-01	2.99747521926273
1975-01-01	3.26195832684474
1975-04-01	3.70276350614808
1975-07-01	3.96724661373009
1975-10-01	3.87908557786942
1976-01-01	4.05540764959076
1976-04-01	4.05540764959076
1976-07-01	3.96724661373009
1976-10-01	3.96724661373009
1977-01-01	4.31989075717276
1977-04-01	4.67253490061544
1977-07-01	4.76069593647611
1977-10-01	4.49621282889410
1978-01-01	4.23172972131209
1978-04-01	4.40805179303343
1978-07-01	4.67253490061544
1978-10-01	4.84885697233678
1979-01-01	5.02517904405811
1979-04-01	5.11334007991878
1979-07-01	5.20150111577945
1979-10-01	5.28966215164012
1980-01-01	5.37782318750079
1980-04-01	5.46598422336146
1980-07-01	5.46598422336146
1980-10-01	5.73046733094346
1981-01-01	5.99495043852547
1981-04-01	6.34759458196814
1981-07-01	6.70023872541082
1981-10-01	6.96472183299282
1982-01-01	6.96472183299282
1982-04-01	7.05288286885349
1982-07-01	7.22920494057483
1982-10-01	7.31736597643550
1983-01-01	7.22920494057483
1983-04-01	7.22920494057483
1983-07-01	7.31736597643550
1983-10-01	7.49368804815683
1984-01-01	8.11081529918151
1984-04-01	8.46345944262419
1984-07-01	8.63978151434553
1984-10-01	8.90426462192753
1985-01-01	8.99242565778820
1985-04-01	8.99242565778820
1985-07-01	9.08058669364887
1985-10-01	9.08058669364887
1986-01-01	8.99242565778820
1986-04-01	9.16874772950954
1986-07-01	9.25690876537021
1986-10-01	9.25690876537021
1987-01-01	9.34506980123087
1987-04-01	9.34506980123087
1987-07-01	9.25690876537021
1987-10-01	9.16874772950954
1988-01-01	8.99242565778820
1988-04-01	8.81610358606686
1988-07-01	8.81610358606686
1988-10-01	8.63978151434553
1989-01-01	8.55162047848486
1989-04-01	8.37529840676352
1989-07-01	8.19897633504218
1989-10-01	8.02265426332084
1990-01-01	7.93449322746018
1990-04-01	7.84633219159951
1990-07-01	7.84633219159951
1990-10-01	7.84633219159951
1991-01-01	7.93449322746018
1991-04-01	8.19897633504218
1991-07-01	8.46345944262419
1991-10-01	8.63978151434553
1992-01-01	8.78671657411331
1992-04-01	8.93365163388109
1992-07-01	9.13936071755598
1992-10-01	9.34506980123087
1993-01-01	9.72710095662710
1993-04-01	10.07974510006980
1993-07-01	10.40300223155890
1993-10-01	10.66748533914090
1994-01-01	10.81442039890870
1994-04-01	10.84380741086220
1994-07-01	10.57932430328020
1994-10-01	10.37361521960530
1995-01-01	10.09482418016590
1995-04-01	9.89743589743590
1995-07-01	10.04957897222000
1995-10-01	10.13020629068950
1996-01-01	10.33432276206840
1996-04-01	10.50745803637500
1996-07-01	10.66469604449460
1996-10-01	10.72943007197040
1997-01-01	10.80575371301600
1997-04-01	10.80838440220150
1997-07-01	10.71107813659260
1997-10-01	10.53535195879510
1998-01-01	10.28776138000860
1998-04-01	10.24196993824520
1998-07-01	10.31450925710740
1998-10-01	10.30139103554870
1999-01-01	10.31130656174050
1999-04-01	10.18183219046150
1999-07-01	9.93153319486114
1999-10-01	9.51412342646607
2000-01-01	9.02623728294959
2000-04-01	8.65355291247331
2000-07-01	8.33681809541912
2000-10-01	8.09303384428593
2001-01-01	7.90611254360686
2001-04-01	7.78059774991477
2001-07-01	7.65391014975042
2001-10-01	7.62615976465264
2002-01-01	7.80733393447550
2002-04-01	7.85906844391194
2002-07-01	7.85082316048830
2002-10-01	7.99970205951361
2003-01-01	8.30000000000000
2003-04-01	7.80000000000000
2003-07-01	7.60000000000000
2003-10-01	8.80000000000000
2004-01-01	8.90000000000000
2004-04-01	8.10000000000000
2004-07-01	8.00000000000000
2004-10-01	8.90000000000000
2005-01-01	8.70000000000000
2005-04-01	8.10000000000000
2005-07-01	8.20000000000000
2005-10-01	9.00000000000000
2006-01-01	9.10000000000000
2006-04-01	8.30000000000000
2006-07-01	8.10000000000000
2006-10-01	8.30000000000000
2007-01-01	8.50000000000000
2007-04-01	7.50000000000000
2007-07-01	7.20000000000000
2007-10-01	7.40000000000000
2008-01-01	7.20000000000000
2008-04-01	6.70000000000000
2008-07-01	6.70000000000000
2008-10-01	7.70000000000000
2009-01-01	8.60000000000000
2009-04-01	8.50000000000000
2009-07-01	8.30000000000000
2009-10-01	9.50000000000000
2010-01-01	9.40000000000000
2010-04-01	8.60000000000000
2010-07-01	8.30000000000000
2010-10-01	9.10000000000000
2011-01-01	9.20000000000000
2011-04-01	8.40000000000000
2011-07-01	8.30000000000000
2011-10-01	9.30000000000000
2012-01-01	9.60000000000000
2012-04-01	9.00000000000000
2012-07-01	8.90000000000000
2012-10-01	10.10000000000000
2013-01-01	10.50000000000000
2013-04-01	9.70000000000000
2013-07-01	9.40000000000000
2013-10-01	10.10000000000000
2014-01-01	10.70000000000000
2014-04-01	9.90000000000000
2014-07-01	9.90000000000000
2014-10-01	10.80000000000000
2015-01-01	10.80000000000000
2015-04-01	10.10000000000000
2015-07-01	10.00000000000000
2015-10-01	10.60000000000000
2016-01-01	10.70000000000000
2016-04-01	9.60000000000000
2016-07-01	9.60000000000000
2016-10-01	10.30000000000000
2017-01-01	10.00000000000000
2017-04-01	9.10000000000000
2017-07-01	9.30000000000000
2017-10-01	9.20000000000000
2018-01-01	9.60000000000000
2018-04-01	8.70000000000000