Quarter	Percent
1990-01-01	13.13
1990-04-01	16.94
1990-07-01	17.63
1990-10-01	18.83
1991-01-01	23.55
1991-04-01	18.99
1991-07-01	18.50
1991-10-01	18.47
1992-01-01	17.99
1992-04-01	16.00
1992-07-01	14.66
1992-10-01	13.50
1993-01-01	12.50
1993-04-01	10.74
1993-07-01	9.11
1993-10-01	8.82
1994-01-01	8.45
1994-04-01	9.94
1994-07-01	11.55
1994-10-01	12.44
1995-01-01	14.13
1995-04-01	14.74
1995-07-01	14.02
1995-10-01	13.99
1996-01-01	13.99
1996-04-01	13.99
1996-07-01	13.96
1996-10-01	12.80
1997-01-01	11.07
1997-04-01	10.50
1997-07-01	22.00
1997-10-01	20.00
1998-01-01	27.75
1998-04-01	58.00
1998-07-01	68.76
1998-10-01	38.44
1999-01-01	37.84
1999-04-01	22.05
1999-07-01	13.02
1999-10-01	12.51
2000-01-01	11.03
2000-04-01	11.74
2000-07-01	13.62
2000-10-01	14.53
2001-01-01	15.58
2001-04-01	16.65
2001-07-01	17.57
2001-10-01	17.62
2002-01-01	16.76
2002-04-01	15.11
2002-07-01	13.22
2002-10-01	12.93
2003-01-01	11.40
2003-04-01	9.53
2003-07-01	8.66
2003-10-01	8.31
2004-01-01	7.42
2004-04-01	7.34
2004-07-01	7.39
2004-10-01	7.43
2005-01-01	7.44
2005-04-01	8.25
2005-07-01	10.00
2005-10-01	12.75
2006-01-01	12.75
2006-04-01	12.50
2006-07-01	11.25
2006-10-01	9.75
2007-01-01	9.00
2007-04-01	8.50
2007-07-01	8.25
2007-10-01	8.00
2008-01-01	8.00
2008-04-01	8.50
2008-07-01	9.25
2008-10-01	9.25
2009-01-01	7.75
2009-04-01	7.00
2009-07-01	6.50
2009-10-01	6.50
2010-01-01	6.50
2010-04-01	6.50
2010-07-01	6.50
2010-10-01	6.50
2011-01-01	6.75
2011-04-01	6.75
2011-07-01	6.75
2011-10-01	6.00
2012-01-01	5.75
2012-04-01	5.75
2012-07-01	5.75
2012-10-01	5.75
2013-01-01	5.75
2013-04-01	6.00
2013-07-01	7.25
2013-10-01	7.50
2014-01-01	7.50
2014-04-01	7.50
2014-07-01	7.50
2014-10-01	7.75
2015-01-01	7.50
2015-04-01	7.50
2015-07-01	7.50
2015-10-01	7.50
2016-01-01	6.75
2016-04-01	6.50
2016-07-01	5.00
2016-10-01	4.75
2017-01-01	4.75
2017-04-01	4.75
2017-07-01	4.25
2017-10-01	4.25
2018-01-01	4.25
2018-04-01	5.25
2018-07-01	5.75