Year	Percent
1980-01-01	0.8957120000000001
1981-01-01	2.8421200000000000
1982-01-01	1.8319100000000000
1983-01-01	2.5506000000000000
1984-01-01	2.1486900000000000
1985-01-01	3.2833900000000003
1986-01-01	3.6194100000000000
1987-01-01	3.5518800000000000
1988-01-01	2.9001700000000000
1989-01-01	2.4319800000000000
1990-01-01	2.2470000000000000
1991-01-01	1.8935400000000002
1992-01-01	1.6232400000000000
1993-01-01	4.0175700000000000
1994-01-01	6.6693800000000000
1995-01-01	7.4833200000000000
1996-01-01	2.4825200000000000
1997-01-01	1.8448500000000000
1998-01-01	1.5757800000000000
1999-01-01	2.1193700000000000
2000-01-01	3.3075500000000000
2001-01-01	3.3208100000000000
2002-01-01	4.1352900000000000
2003-01-01	4.2076300000000000
2004-01-01	4.6878900000000000
2005-01-01	3.3862000000000000
2006-01-01	6.2481200000000000
2007-01-01	4.4036100000000000
2008-01-01	2.5182500000000000
2009-01-01	5.1006700000000000
2010-01-01	5.3551199999999990
2011-01-01	7.0494500000000000
2012-01-01	11.8402000000000000
2013-01-01	15.2459999999999990
2014-01-01	14.7077000000000000
2015-01-01	9.8273000000000000