Year	Percent
1983-01-01	15.115300000000000
1984-01-01	14.280900000000000
1985-01-01	14.062000000000001
1986-01-01	12.195800000000000
1987-01-01	8.885900000000000
1988-01-01	6.712430000000000
1989-01-01	6.608930000000000
1990-01-01	9.286489999999999
1991-01-01	14.777000000000001
1992-01-01	9.556880000000000
1993-01-01	7.146750000000000
1994-01-01	6.422270000000000
1995-01-01	5.663140000000000
1996-01-01	5.154540000000000
1997-01-01	5.671320000000000
1998-01-01	6.067570000000000
1999-01-01	9.496050000000000
2000-01-01	10.031500000000000
2001-01-01	10.741400000000000
2002-01-01	12.847200000000000
2003-01-01	15.000700000000000
2004-01-01	15.065600000000000
2005-01-01	17.584900000000000
2006-01-01	21.810900000000000
2007-01-01	24.021500000000000
2008-01-01	22.879300000000000
2009-01-01	20.829400000000000
2010-01-01	21.717000000000000
2011-01-01	15.833300000000000
2012-01-01	14.196500000000000
2013-01-01	10.310100000000000
2014-01-01	9.938800000000000
2015-01-01	9.672770000000000
2016-01-01	10.741600000000000