Year	Percent
1982-01-01	87.7018000000000000
1983-01-01	86.4008000000000000
1984-01-01	82.0752000000000000
1985-01-01	78.8812000000000000
1986-01-01	79.4615000000000000
1987-01-01	64.4747000000000000
1988-01-01	46.9522000000000000
1989-01-01	42.5482000000000000
1990-01-01	50.3133000000000000
1991-01-01	60.4094000000000000
1992-01-01	58.7074000000000000
1993-01-01	55.8457000000000000
1994-01-01	52.4869999999999950
1995-01-01	50.5693000000000000
1996-01-01	44.2857000000000000
1997-01-01	33.6333000000000000
1998-01-01	28.4118000000000000
1999-01-01	23.8274000000000000
2000-01-01	17.8516000000000000
2001-01-01	12.8408000000000000
2002-01-01	8.3963399999999990
2003-01-01	5.3938200000000000
2004-01-01	3.3012599999999996
2005-01-01	1.7981099999999999
2006-01-01	1.0414200000000000
2007-01-01	0.7995110000000000
2008-01-01	0.9818979999999999
2009-01-01	1.2682600000000000
2010-01-01	1.0176800000000000
2011-01-01	0.7797260000000000
2012-01-01	0.5838310000000000
2013-01-01	0.4998030000000000
2014-01-01	0.4686530000000000
2015-01-01	0.3044150000000000
2016-01-01	0.1326170000000000