Year	Percent
1983-01-01	2.7252500000000000
1984-01-01	2.8068800000000000
1985-01-01	2.7117299999999998
1986-01-01	2.6268599999999998
1987-01-01	2.5145299999999997
1988-01-01	2.7304500000000000
1989-01-01	3.6275699999999995
1990-01-01	4.2115100000000000
1991-01-01	4.7966900000000000
1992-01-01	6.0985700000000000
1993-01-01	6.7708000000000000
1994-01-01	7.6864800000000000
1995-01-01	8.0554399999999990
1996-01-01	7.0917200000000000
1997-01-01	8.8716500000000000
1998-01-01	10.2426000000000000
1999-01-01	8.7219600000000010
2000-01-01	7.6167899999999990
2001-01-01	9.3034699999999990
2002-01-01	10.6371000000000000
2003-01-01	12.4883000000000000
2004-01-01	14.7160000000000000
2005-01-01	17.1101000000000000
2006-01-01	20.2145000000000000
2007-01-01	23.2568000000000000
2008-01-01	28.2031000000000000
2009-01-01	31.7519000000000000
2010-01-01	37.5597000000000000
2011-01-01	44.4796000000000000
2012-01-01	47.3771000000000000
2013-01-01	46.4387000000000000
2014-01-01	45.2397000000000000
2015-01-01	44.6859000000000000
2016-01-01	46.1966000000000000