Year	Percent
1983-01-01	24.688400000000000
1984-01-01	20.692300000000000
1985-01-01	33.174200000000000
1986-01-01	28.193800000000000
1987-01-01	29.115400000000000
1988-01-01	25.193800000000000
1989-01-01	33.980400000000000
1990-01-01	18.105000000000000
1991-01-01	13.699200000000000
1992-01-01	13.365500000000000
1993-01-01	13.172400000000000
1994-01-01	14.042300000000000
1995-01-01	15.061600000000000
1996-01-01	17.184100000000000
1997-01-01	24.091300000000000
1998-01-01	24.945700000000000
1999-01-01	29.328500000000000
2000-01-01	29.644100000000000
2001-01-01	25.092900000000000
2002-01-01	35.258200000000000
2003-01-01	25.505300000000000
2004-01-01	18.623900000000000
2005-01-01	13.697900000000000
2006-01-01	14.793200000000000
2007-01-01	13.007900000000000
2008-01-01	9.702320000000000
2009-01-01	10.305600000000000
2010-01-01	9.289840000000000
2011-01-01	9.148589999999999
2012-01-01	8.232690000000000
2013-01-01	7.047739999999999
2014-01-01	7.395169999999999
2015-01-01	6.790300000000000
2016-01-01	7.945760000000001