Year	Percent
1983-01-01	39.806600000000000
1984-01-01	37.735600000000000
1985-01-01	40.452800000000000
1986-01-01	44.124300000000000
1987-01-01	38.336999999999996
1988-01-01	29.551900000000000
1989-01-01	22.408000000000000
1990-01-01	20.704700000000000
1991-01-01	19.202900000000000
1992-01-01	12.740400000000000
1993-01-01	10.757400000000000
1994-01-01	11.419300000000000
1995-01-01	11.867800000000000
1996-01-01	17.318800000000000
1997-01-01	25.547600000000000
1998-01-01	27.559700000000000
1999-01-01	25.462900000000000
2000-01-01	26.626100000000000
2001-01-01	29.192800000000000
2002-01-01	25.440800000000000
2003-01-01	28.721900000000000
2004-01-01	26.449200000000000
2005-01-01	25.716100000000000
2006-01-01	22.247600000000000
2007-01-01	20.728400000000000
2008-01-01	14.057200000000000
2009-01-01	16.242700000000000
2010-01-01	17.336000000000000
2011-01-01	16.550200000000000
2012-01-01	17.230400000000000
2013-01-01	15.647900000000000
2014-01-01	15.060400000000000
2015-01-01	13.792000000000000
2016-01-01	13.335500000000000