Year	Percent
1980-01-01	5.982120000000000
1981-01-01	6.122470000000000
1982-01-01	6.797650000000000
1983-01-01	10.100000000000000
1984-01-01	9.577430000000000
1985-01-01	12.276700000000000
1986-01-01	11.283300000000000
1987-01-01	9.354330000000001
1988-01-01	8.294870000000000
1989-01-01	10.944600000000000
1990-01-01	10.452700000000000
1991-01-01	9.591500000000000
1992-01-01	10.536800000000000
1993-01-01	16.747500000000000
1994-01-01	21.353500000000000
1995-01-01	22.003800000000000
1996-01-01	22.076300000000000
1997-01-01	19.222300000000000
1998-01-01	16.464400000000000
1999-01-01	14.909100000000000
2000-01-01	15.849100000000000
2001-01-01	20.432300000000000
2002-01-01	22.518500000000000
2003-01-01	19.010500000000000
2004-01-01	15.923800000000000
2005-01-01	8.394500000000000
2006-01-01	14.683000000000000
2007-01-01	11.564700000000000
2008-01-01	11.483300000000000
2009-01-01	15.310900000000000
2010-01-01	18.335300000000000
2011-01-01	20.599800000000000
2012-01-01	26.241100000000000
2013-01-01	24.207400000000000
2014-01-01	25.802400000000000
2015-01-01	19.551400000000000
2016-01-01	10.950600000000000