Year	Percent
1985-01-01	1.44491145083333
1986-01-01	1.26981405775000
1987-01-01	1.45810669758333
1988-01-01	1.35129045825000
1989-01-01	1.22233414658333
1990-01-01	1.09931768300000
1991-01-01	1.21171439775000
1992-01-01	1.43691450783333
1993-01-01	1.85082964383333
1994-01-01	2.40830425958333
1995-01-01	2.61521090733333
1996-01-01	2.86398602475000
1997-01-01	3.08329506150000
1998-01-01	2.85183207966667
1999-01-01	2.69697836850000
2000-01-01	2.40173669541667
2001-01-01	2.23061890008333
2002-01-01	2.49645951150000
2003-01-01	3.29831502491667
2004-01-01	3.70861576283333
2005-01-01	4.09184573533333
2006-01-01	4.23954106091667
2007-01-01	4.18061942625000
2008-01-01	4.15101674700000
2009-01-01	5.44645583375000
2010-01-01	5.79773965983333
2011-01-01	5.65499150283333
2012-01-01	6.07203147391667
2013-01-01	6.86666666666667
2014-01-01	7.13333333333333
2015-01-01	6.84166666666667
2016-01-01	6.41666666666667