Quarter	Percent
1987-01-01	7.43
1987-04-01	7.14
1987-07-01	7.08
1987-10-01	7.19
1988-01-01	6.98
1988-04-01	6.87
1988-07-01	7.14
1988-10-01	7.27
1989-01-01	7.39
1989-04-01	7.65
1989-07-01	7.72
1989-10-01	8.21
1990-01-01	9.15
1990-04-01	9.22
1990-07-01	9.22
1990-10-01	9.61
1991-01-01	9.31
1991-04-01	8.85
1991-07-01	8.88
1991-10-01	8.95
1992-01-01	8.86
1992-04-01	8.80
1992-07-01	8.97
1992-10-01	8.71
1993-01-01	7.91
1993-04-01	7.63
1993-07-01	7.43
1993-10-01	7.36
1994-01-01	6.92
1994-04-01	7.19
1994-07-01	7.88
1994-10-01	8.17
1995-01-01	8.05
1995-04-01	7.62
1995-07-01	7.21
1995-10-01	6.89
1996-01-01	6.82
1996-04-01	6.67
1996-07-01	6.45
1996-10-01	6.04
1997-01-01	5.81
1997-04-01	5.83
1997-07-01	5.72
1997-10-01	5.70
1998-01-01	5.32
1998-04-01	5.19
1998-07-01	5.04
1998-10-01	4.72
1999-01-01	4.23
1999-04-01	4.40
1999-07-01	5.23
1999-10-01	5.46
2000-01-01	5.89
2000-04-01	5.87
2000-07-01	5.99
2000-10-01	5.90
2001-01-01	5.49
2001-04-01	5.55
2001-07-01	5.39
2001-10-01	5.07
2002-01-01	5.45
2002-04-01	5.55
2002-07-01	5.17
2002-10-01	4.99
2003-01-01	4.48
2003-04-01	4.10
2003-07-01	4.30
2003-10-01	4.47
2004-01-01	4.26
2004-04-01	4.42
2004-07-01	4.27
2004-10-01	4.00
2005-01-01	3.74
2005-04-01	3.53
2005-07-01	3.35
2005-10-01	3.57
2006-01-01	3.81
2006-04-01	4.24
2006-07-01	4.21
2006-10-01	4.13
2007-01-01	4.40
2007-04-01	4.74
2007-07-01	4.92
2007-10-01	4.99
2008-01-01	5.05
2008-04-01	5.33
2008-07-01	5.66
2008-10-01	5.76
2009-01-01	5.06
2009-04-01	5.01
2009-07-01	4.18
2009-10-01	3.82
2010-01-01	3.72
2010-04-01	3.43
2010-07-01	3.13
2010-10-01	3.47
2011-01-01	4.01
2011-04-01	4.10
2011-07-01	3.81
2011-10-01	3.78
2012-01-01	3.34
2012-04-01	2.74
2012-07-01	2.28
2012-10-01	2.04
2013-01-01	2.06
2013-04-01	1.86
2013-07-01	2.24
2013-10-01	2.17
2014-01-01	1.69