Year	Percent
1985-01-01	3.8505700000000000
1986-01-01	4.0147300000000000
1987-01-01	5.0306600000000000
1988-01-01	5.3413200000000000
1989-01-01	5.6311900000000000
1990-01-01	5.8671800000000000
1991-01-01	6.1022500000000000
1992-01-01	5.9509900000000000
1993-01-01	5.6008400000000000
1994-01-01	4.9216000000000000
1995-01-01	3.8775300000000000
1996-01-01	3.1730500000000000
1997-01-01	2.5135400000000003
1998-01-01	2.0159400000000000
1999-01-01	1.8517700000000001
2000-01-01	1.6771200000000002
2001-01-01	2.1179300000000000
2002-01-01	2.4800100000000000
2003-01-01	2.2199000000000000
2004-01-01	1.9173000000000000
2005-01-01	1.6075600000000000
2006-01-01	1.3262100000000000
2007-01-01	3.4707100000000000
2008-01-01	5.1915100000000000
2009-01-01	4.5482400000000000
2010-01-01	3.7810800000000000
2011-01-01	3.2035700000000000
2012-01-01	2.8496400000000000
2013-01-01	2.5776100000000000
2014-01-01	2.3755500000000000
2015-01-01	2.2007900000000000
2016-01-01	2.0677500000000000