Year	Percent
1980-01-01	13.590500000000000
1981-01-01	14.229900000000000
1982-01-01	18.630800000000000
1983-01-01	18.622400000000000
1984-01-01	20.536300000000000
1985-01-01	29.443300000000000
1986-01-01	36.928100000000000
1987-01-01	44.557500000000000
1988-01-01	35.429900000000000
1989-01-01	33.067300000000000
1990-01-01	35.833600000000000
1991-01-01	34.264700000000000
1992-01-01	28.699000000000000
1993-01-01	22.809900000000000
1994-01-01	19.311200000000000
1995-01-01	15.113800000000000
1996-01-01	12.799400000000000
1997-01-01	12.873100000000000
1998-01-01	15.481800000000000
1999-01-01	13.936400000000000
2000-01-01	15.437999999999999
2001-01-01	16.148200000000000
2002-01-01	14.999600000000000
2003-01-01	11.619700000000000
2004-01-01	11.130600000000000
2005-01-01	6.624190000000000
2006-01-01	6.436990000000000
2007-01-01	7.350320000000000
2008-01-01	5.737380000000000
2009-01-01	8.232890000000000
2010-01-01	9.705789999999999
2011-01-01	11.901200000000000
2012-01-01	13.501500000000000
2013-01-01	12.658200000000000
2014-01-01	10.141100000000000
2015-01-01	11.721500000000000
2016-01-01	8.106290000000000