Year	Percent
1983-01-01	1.1835600000000000
1984-01-01	3.1430300000000000
1985-01-01	1.1681100000000000
1986-01-01	3.3255700000000000
1987-01-01	1.1649399999999999
1988-01-01	1.1871300000000000
1989-01-01	1.4385000000000000
1990-01-01	1.9624900000000000
1991-01-01	1.1984800000000000
1992-01-01	2.1713200000000000
1993-01-01	1.7154500000000000
1994-01-01	1.5803100000000000
1995-01-01	1.2847600000000001
1996-01-01	1.4299500000000000
1997-01-01	1.4970200000000000
1998-01-01	2.1912900000000000
1999-01-01	4.6939300000000000
2000-01-01	5.8382700000000000
2001-01-01	6.8725399999999990
2002-01-01	5.6056000000000000
2003-01-01	9.1757400000000000
2004-01-01	6.6263500000000000
2005-01-01	6.2793100000000000
2006-01-01	5.7782300000000010
2007-01-01	8.0092699999999990
2008-01-01	5.7643200000000000
2009-01-01	4.9355900000000000
2010-01-01	5.2890200000000000
2011-01-01	6.1305200000000000
2012-01-01	6.3391800000000010
2013-01-01	6.3026800000000005
2014-01-01	7.1528700000000000
2015-01-01	6.6088500000000000
2016-01-01	7.0641000000000000