Quarter	Percent
1986-01-01	11.75000000000000
1986-04-01	11.63000000000000
1986-07-01	11.02000000000000
1986-10-01	9.19000000000000
1987-01-01	8.97000000000000
1987-04-01	10.30000000000000
1987-07-01	10.46000000000000
1987-10-01	8.17000000000000
1988-01-01	8.26000000000000
1988-04-01	9.13000000000000
1988-07-01	8.66000000000000
1988-10-01	6.51000000000000
1989-01-01	6.48000000000000
1989-04-01	7.40000000000000
1989-07-01	7.20000000000000
1989-10-01	6.06000000000000
1990-01-01	5.95000000000000
1990-04-01	7.42000000000000
1990-07-01	7.78000000000000
1990-10-01	6.62000000000000
1991-01-01	6.81000000000000
1991-04-01	7.69000000000000
1991-07-01	8.37000000000000
1991-10-01	6.07000000000000
1992-01-01	5.73000000000000
1992-04-01	5.87000000000000
1992-07-01	6.02000000000000
1992-10-01	4.94000000000000
1993-01-01	4.93000000000000
1993-04-01	5.53000000000000
1993-07-01	5.85000000000000
1993-10-01	5.27000000000000
1994-01-01	5.45000000000000
1994-04-01	6.88000000000000
1994-07-01	7.84000000000000
1994-10-01	6.53000000000000
1995-01-01	6.15000000000000
1995-04-01	6.76000000000000
1995-07-01	6.73000000000000
1995-10-01	5.48000000000000
1996-01-01	5.48000000000000
1996-04-01	5.85000000000000
1996-07-01	6.28000000000000
1996-10-01	4.77000000000000
1997-01-01	4.92000000000000
1997-04-01	5.90000000000000
1997-07-01	5.90000000000000
1997-10-01	4.74000000000000
1998-01-01	4.48000000000000
1998-04-01	5.40000000000000
1998-07-01	6.23000000000000
1998-10-01	7.12000000000000
1999-01-01	8.15000000000000
1999-04-01	10.82000000000000
1999-07-01	11.51000000000000
1999-10-01	8.66000000000000
2000-01-01	7.77000000000000
2000-04-01	9.72000000000000
2000-07-01	11.17000000000000
2000-10-01	8.64000000000000
2001-01-01	9.06000000000000
2001-04-01	10.39000000000000
2001-07-01	10.94000000000000
2001-10-01	8.53000000000000
2002-01-01	9.11000000000000
2002-04-01	10.21000000000000
2002-07-01	10.73000000000000
2002-10-01	8.48000000000000
2003-01-01	8.54000000000000
2003-04-01	9.63000000000000
2003-07-01	10.13000000000000
2003-10-01	8.21000000000000
2004-01-01	8.51000000000000
2004-04-01	10.35000000000000
2004-07-01	10.49000000000000
2004-10-01	8.08000000000000
2005-01-01	8.01000000000000
2005-04-01	9.40000000000000
2005-07-01	9.23000000000000
2005-10-01	7.25000000000000
2006-01-01	7.10000000000000
2006-04-01	7.78000000000000
2006-07-01	7.06000000000000
2006-10-01	5.47000000000000
2007-01-01	5.71000000000000
2007-04-01	6.23000000000000
2007-07-01	6.95000000000000
2007-10-01	6.26000000000000
2008-01-01	6.36000000000000
2008-04-01	7.29000000000000
2008-07-01	6.73000000000000
2008-10-01	6.74000000000000
2009-01-01	8.20000000000000
2009-04-01	10.30000000000000
2009-07-01	9.70000000000000
2009-10-01	8.10000000000000
2010-01-01	7.90000000000000
2010-04-01	7.50000000000000
2010-07-01	7.20000000000000
2010-10-01	6.20000000000000
2011-01-01	6.20000000000000
2011-04-01	6.00000000000000
2011-07-01	6.50000000000000
2011-10-01	5.50000000000000
2012-01-01	5.20000000000000
2012-04-01	5.79635374669517
2012-07-01	5.45534836304289
2012-10-01	5.22532026752122
2013-01-01	5.32842219119041
2013-04-01	5.53392298237686
2013-07-01	5.17090662585555
2013-10-01	5.08230584161808
2014-01-01	5.98670573497195
2014-04-01	6.22311773797170
2014-07-01	6.31797226121216
2014-10-01	5.63394954141448
2015-01-01	5.36117296734144
2015-04-01	5.91596347727138
2015-07-01	6.06894842930936
2015-10-01	5.77321739513619
2016-01-01	5.60767235845341
2016-04-01	6.60331363804501
2016-07-01	6.43624241469649
2016-10-01	5.84502709613355
2017-01-01	5.97178508062540
2017-04-01	6.63806120050348
2017-07-01	6.56469359180457
2017-10-01	6.01566587487628
2018-01-01	6.18347908869148
2018-04-01	6.58665199966511
2018-07-01	6.83223435901300