Year	Percent
1982-01-01	9.515989999999999
1983-01-01	9.475150000000000
1984-01-01	11.317100000000000
1985-01-01	9.894720000000000
1986-01-01	7.333390000000000
1987-01-01	7.985939999999999
1988-01-01	9.839630000000000
1989-01-01	10.689800000000000
1990-01-01	11.405600000000000
1991-01-01	12.762100000000000
1992-01-01	13.200200000000000
1993-01-01	11.964300000000000
1994-01-01	11.091000000000000
1995-01-01	10.716000000000000
1996-01-01	8.059300000000000
1997-01-01	8.444550000000000
1998-01-01	8.319780000000000
1999-01-01	8.906230000000000
2000-01-01	8.715480000000000
2001-01-01	7.743650000000000
2002-01-01	7.050389999999999
2003-01-01	7.782280000000000
2004-01-01	8.108450000000000
2005-01-01	7.957630000000000
2006-01-01	8.707210000000000
2007-01-01	9.363840000000000
2008-01-01	10.921000000000000
2009-01-01	13.805100000000000
2010-01-01	17.088500000000000
2011-01-01	17.916400000000000
2012-01-01	19.451400000000000
2013-01-01	20.392400000000000
2014-01-01	24.244300000000000
2015-01-01	25.553600000000000
2016-01-01	28.788400000000000