Year	Percent
1983-01-01	33.996800000000000
1984-01-01	28.574000000000000
1985-01-01	28.769700000000000
1986-01-01	32.622800000000000
1987-01-01	24.406000000000000
1988-01-01	24.021800000000000
1989-01-01	23.410200000000000
1990-01-01	31.698700000000000
1991-01-01	35.735600000000000
1992-01-01	41.834300000000000
1993-01-01	38.640900000000000
1994-01-01	35.568100000000000
1995-01-01	26.741700000000000
1996-01-01	14.489400000000000
1997-01-01	17.271100000000000
1998-01-01	20.847600000000000
1999-01-01	19.523000000000000
2000-01-01	13.518800000000000
2001-01-01	17.968100000000000
2002-01-01	16.042700000000000
2003-01-01	13.828000000000000
2004-01-01	13.209000000000001
2005-01-01	11.375300000000000
2006-01-01	11.714400000000000
2007-01-01	18.241300000000000
2008-01-01	12.561400000000000
2009-01-01	20.240100000000000
2010-01-01	14.756200000000000
2011-01-01	10.011000000000001
2012-01-01	9.213950000000000
2013-01-01	7.567760000000001
2014-01-01	10.583800000000000
2015-01-01	14.548100000000000
2016-01-01	20.725200000000000