Year	Percent
1976-01-01	0.455272000000000
1977-01-01	1.835710000000000
1978-01-01	2.168830000000000
1979-01-01	2.887140000000000
1980-01-01	1.372150000000000
1981-01-01	2.108690000000000
1982-01-01	3.300790000000000
1983-01-01	3.292310000000000
1984-01-01	4.345540000000000
1985-01-01	4.135390000000000
1986-01-01	4.170340000000000
1987-01-01	4.715460000000000
1988-01-01	5.029740000000000
1989-01-01	5.439350000000000
1990-01-01	7.603020000000000
1991-01-01	9.048060000000001
1992-01-01	11.943200000000000
1993-01-01	11.911900000000000
1994-01-01	12.653800000000000
1995-01-01	11.924500000000000
1996-01-01	11.306100000000000
1997-01-01	11.734700000000000
1998-01-01	12.237000000000000
1999-01-01	12.282700000000000
2000-01-01	14.970000000000000
2001-01-01	15.667000000000000
2002-01-01	15.418300000000000
2003-01-01	16.017200000000000
2004-01-01	18.674200000000000
2005-01-01	20.605500000000000
2006-01-01	21.767000000000000
2007-01-01	21.802900000000000
2008-01-01	20.874900000000000
2009-01-01	19.329700000000000
2010-01-01	18.819700000000000
2011-01-01	17.964800000000000
2012-01-01	18.301800000000000
2013-01-01	18.048000000000000
2014-01-01	18.420300000000000
2015-01-01	18.532400000000000
2016-01-01	19.232300000000000
2017-01-01	20.374700000000000