Year	Percent
1983-01-01	14.274400000000000
1984-01-01	14.119200000000000
1985-01-01	14.111100000000000
1986-01-01	11.838100000000000
1987-01-01	11.109600000000000
1988-01-01	9.488170000000000
1989-01-01	9.383150000000000
1990-01-01	8.186620000000000
1991-01-01	6.230820000000000
1992-01-01	5.578790000000001
1993-01-01	6.039980000000000
1994-01-01	7.066960000000001
1995-01-01	5.882690000000000
1996-01-01	5.724630000000000
1997-01-01	6.441940000000000
1998-01-01	8.448730000000000
1999-01-01	20.275900000000000
2000-01-01	12.009600000000000
2001-01-01	17.037100000000000
2002-01-01	24.503800000000000
2003-01-01	24.216500000000000
2004-01-01	21.353800000000000
2005-01-01	18.031400000000000
2006-01-01	18.891600000000000
2007-01-01	25.433100000000000
2008-01-01	19.326000000000000
2009-01-01	20.678700000000000
2010-01-01	21.503400000000000
2011-01-01	19.617600000000000
2012-01-01	22.461300000000000
2013-01-01	22.507700000000000
2014-01-01	21.249500000000000
2015-01-01	23.320900000000000
2016-01-01	22.177900000000000