Quarter	Percent
1985-01-01	67.32
1985-04-01	21.75
1985-07-01	24.64
1985-10-01	19.49
1986-01-01	19.45
1986-04-01	14.66
1986-07-01	14.50
1986-10-01	22.74
1987-01-01	27.20
1987-04-01	18.98
1987-07-01	18.31
1987-10-01	16.33
1988-01-01	15.50
1988-04-01	15.94
1988-07-01	14.27
1988-10-01	13.10
1989-01-01	12.80
1989-04-01	13.40
1989-07-01	13.73
1989-10-01	13.18
1990-01-01	13.12
1990-04-01	13.69
1990-07-01	13.87
1990-10-01	11.63
1991-01-01	11.77
1991-04-01	10.12
1991-07-01	8.92
1991-10-01	7.75
1992-01-01	7.04
1992-04-01	6.69
1992-07-01	6.26
1992-10-01	7.01
1993-01-01	7.06
1993-04-01	5.91
1993-07-01	4.90
1993-10-01	4.80
1994-01-01	5.70
1994-04-01	5.16
1994-07-01	6.41
1994-10-01	8.39
1995-01-01	9.15
1995-04-01	9.00
1995-07-01	9.52
1995-10-01	8.69
1996-01-01	9.07
1996-04-01	9.53
1996-07-01	9.98
1996-10-01	8.40
1997-01-01	7.44
1997-04-01	6.67
1997-07-01	7.87
1997-10-01	7.64
1998-01-01	8.60
1998-04-01	8.91
1998-07-01	5.43
1998-10-01	3.49
1999-01-01	4.07
1999-04-01	4.54
1999-07-01	4.50
1999-10-01	5.00
2000-01-01	5.51
2000-04-01	6.50
2000-07-01	6.50
2000-10-01	6.51
2001-01-01	6.35
2001-04-01	5.75
2001-07-01	5.55
2001-10-01	4.75
2002-01-01	4.84
2002-04-01	5.50
2002-07-01	5.75
2002-10-01	5.75
2003-01-01	5.75
2003-04-01	5.28
2003-07-01	5.00
2003-10-01	5.00
2004-01-01	5.25
2004-04-01	5.68
2004-07-01	6.18
2004-10-01	6.50
2005-01-01	6.67
2005-04-01	6.75
2005-07-01	6.75
2005-10-01	7.19
2006-01-01	7.25
2006-04-01	7.25
2006-07-01	7.25
2006-10-01	7.51
2007-01-01	7.59
2007-04-01	8.10
2007-07-01	8.02
2007-10-01	8.18
2008-01-01	8.10
2008-04-01	8.21
2008-07-01	7.52
2008-10-01	5.05
2009-01-01	3.08
2009-04-01	2.45
2009-07-01	2.58
2009-10-01	2.43
2010-01-01	2.35
2010-04-01	2.49
2010-07-01	2.91
2010-10-01	2.88
2011-01-01	2.50
2011-04-01	2.46
2011-07-01	2.39
2011-10-01	2.34
2012-01-01	2.43
2012-04-01	2.43
2012-07-01	2.49
2012-10-01	2.51
2013-01-01	2.47
2013-04-01	2.47
2013-07-01	2.50
2013-10-01	2.50
2014-01-01	2.65
2014-04-01	3.13
2014-07-01	3.46
2014-10-01	3.40
2015-01-01	3.42
2015-04-01	3.25
2015-07-01	2.76
2015-10-01	2.55
2016-01-01	2.21
2016-04-01	2.16
2016-07-01	1.92
2016-10-01	1.68
2017-01-01	1.66
2017-04-01	1.71
2017-07-01	1.64
2017-10-01	1.67
2018-01-01	1.67
2018-04-01	1.69
2018-07-01	1.68