Year	Percent
1982-01-01	1.6173799999999998
1983-01-01	1.5615000000000000
1984-01-01	1.7116900000000002
1985-01-01	2.0242600000000000
1986-01-01	2.1796700000000000
1987-01-01	2.1707500000000000
1988-01-01	2.3755599999999997
1989-01-01	2.7241000000000000
1990-01-01	2.6800900000000003
1991-01-01	2.9303400000000000
1992-01-01	3.3530300000000004
1993-01-01	3.2778300000000002
1994-01-01	4.5028500000000000
1995-01-01	4.2029700000000000
1996-01-01	4.0358700000000000
1997-01-01	3.8859300000000000
1998-01-01	3.9395400000000000
1999-01-01	3.7584400000000002
2000-01-01	3.5842099999999997
2001-01-01	3.0034500000000000
2002-01-01	2.7339800000000000
2003-01-01	2.6638200000000000
2004-01-01	2.3795000000000000
2005-01-01	2.5171400000000000
2006-01-01	3.2146300000000000
2007-01-01	3.5538900000000000
2008-01-01	3.7822199999999997
2009-01-01	4.4346000000000000
2010-01-01	5.2401700000000000
2011-01-01	5.7715100000000000
2012-01-01	6.1445099999999995
2013-01-01	6.0217100000000000
2014-01-01	6.8364300000000000
2015-01-01	5.5510800000000010
2016-01-01	5.6413800000000010