Year	Percent
1980-01-01	3.0101400000000003
1981-01-01	4.4518800000000000
1982-01-01	5.6389700000000000
1983-01-01	8.5296600000000000
1984-01-01	6.4438000000000000
1985-01-01	7.5252300000000005
1986-01-01	8.3976000000000000
1987-01-01	13.2168000000000000
1988-01-01	13.6734000000000000
1989-01-01	11.2905000000000000
1990-01-01	8.8939800000000000
1991-01-01	6.7774600000000005
1992-01-01	5.4433800000000000
1993-01-01	6.2198400000000005
1994-01-01	4.3640800000000000
1995-01-01	7.9890800000000000
1996-01-01	8.2808700000000000
1997-01-01	12.9668000000000000
1998-01-01	8.4046000000000000
1999-01-01	7.7097600000000000
2000-01-01	5.3739200000000000
2001-01-01	10.0028000000000000
2002-01-01	10.7813000000000000
2003-01-01	9.4386500000000000
2004-01-01	8.3263199999999990
2005-01-01	10.9276000000000000
2006-01-01	7.5774500000000000
2007-01-01	7.1004600000000010
2008-01-01	6.0515000000000000
2009-01-01	15.5019000000000000
2010-01-01	15.1792000000000000
2011-01-01	12.4436000000000000
2012-01-01	15.2932000000000000
2013-01-01	14.5551000000000000
2014-01-01	17.5321000000000000
2015-01-01	19.1043000000000000
2016-01-01	23.3055000000000000