Year	Percent
1983-01-01	24.0524000000000000
1984-01-01	20.9631000000000000
1985-01-01	16.2683000000000000
1986-01-01	8.9545600000000000
1987-01-01	8.9664600000000010
1988-01-01	6.6705600000000010
1989-01-01	10.1641000000000000
1990-01-01	5.0307000000000000
1991-01-01	5.4310500000000000
1992-01-01	5.4488000000000000
1993-01-01	4.2468300000000000
1994-01-01	5.7532200000000000
1995-01-01	4.0104900000000000
1996-01-01	4.1753400000000000
1997-01-01	3.4787800000000004
1998-01-01	4.0695100000000000
1999-01-01	8.3207100000000000
2000-01-01	9.4263100000000000
2001-01-01	8.4813900000000000
2002-01-01	9.7651600000000000
2003-01-01	9.6792100000000010
2004-01-01	9.0342399999999990
2005-01-01	9.8810800000000000
2006-01-01	8.5645800000000000
2007-01-01	9.5900000000000000
2008-01-01	9.2101899999999990
2009-01-01	11.6977000000000000
2010-01-01	12.2284000000000000
2011-01-01	9.4248500000000000
2012-01-01	11.0073000000000000
2013-01-01	13.1212000000000000
2014-01-01	12.8128000000000000
2015-01-01	12.8159000000000000
2016-01-01	12.7466000000000000