Year	Percent
1983-01-01	80.313400000000000
1984-01-01	34.709500000000000
1985-01-01	20.999500000000000
1986-01-01	16.743300000000000
1987-01-01	25.283200000000000
1988-01-01	18.854200000000000
1989-01-01	18.140900000000000
1990-01-01	30.284100000000000
1991-01-01	24.964100000000000
1992-01-01	8.559250000000000
1993-01-01	7.502140000000000
1994-01-01	7.151810000000000
1995-01-01	7.238519999999999
1996-01-01	8.079100000000000
1997-01-01	8.009200000000000
1998-01-01	14.912100000000000
1999-01-01	16.552300000000000
2000-01-01	15.996100000000000
2001-01-01	17.552200000000000
2002-01-01	19.418000000000000
2003-01-01	17.898900000000000
2004-01-01	17.897600000000000
2005-01-01	22.306200000000000
2006-01-01	15.290200000000000
2007-01-01	15.973900000000000
2008-01-01	67.565000000000000
2009-01-01	49.072800000000000
2010-01-01	39.791300000000000
2011-01-01	37.336000000000000
2012-01-01	26.129900000000000
2013-01-01	40.395400000000000
2014-01-01	37.101100000000000
2015-01-01	22.899400000000000
2016-01-01	18.709900000000000