Year	Percent
1980-01-01	7.0144100000000010
1981-01-01	7.0869899999999990
1982-01-01	6.3681400000000000
1983-01-01	4.6029200000000000
1984-01-01	4.2167100000000000
1985-01-01	5.0354600000000000
1986-01-01	4.2688100000000000
1987-01-01	2.6872200000000000
1988-01-01	1.6762400000000002
1989-01-01	1.0581000000000000
1990-01-01	0.5278200000000000
1991-01-01	1.9530800000000000
1992-01-01	1.7890300000000000
1993-01-01	1.7751700000000001
1994-01-01	1.1597899999999999
1995-01-01	1.0940299999999998
1996-01-01	1.1794600000000000
1997-01-01	1.2831900000000000
1998-01-01	1.3829100000000000
1999-01-01	1.9141200000000000
2000-01-01	2.0428599999999997
2001-01-01	1.9908000000000000
2002-01-01	2.5677300000000000
2003-01-01	3.8943900000000000
2004-01-01	5.3227500000000000
2005-01-01	5.3359500000000000
2006-01-01	5.5794100000000000
2007-01-01	4.4064400000000000
2008-01-01	3.6088300000000000
2009-01-01	4.2053900000000000
2010-01-01	4.4167700000000000
2011-01-01	4.1555700000000000
2012-01-01	4.5520200000000000
2013-01-01	4.4652600000000000
2014-01-01	4.5681300000000000
2015-01-01	4.2935500000000000
2016-01-01	4.2072300000000000