Year	Percent
1979-01-01	9.884770000000000
1980-01-01	12.098200000000000
1981-01-01	17.963300000000000
1982-01-01	33.672300000000000
1983-01-01	27.193200000000000
1984-01-01	11.357999999999999
1985-01-01	18.200600000000000
1986-01-01	26.172200000000000
1987-01-01	30.146600000000000
1988-01-01	20.768700000000000
1989-01-01	14.310000000000000
1990-01-01	15.464600000000000
1991-01-01	18.154900000000000
1992-01-01	32.209900000000000
1993-01-01	57.690900000000000
1994-01-01	54.945400000000000
1995-01-01	34.762400000000000
1996-01-01	32.290000000000000
1997-01-01	34.892900000000000
1998-01-01	35.479500000000000
1999-01-01	43.493600000000000
2000-01-01	50.148500000000000
2001-01-01	46.920600000000000
2002-01-01	39.411700000000000
2003-01-01	45.202700000000000
2004-01-01	60.366100000000000
2005-01-01	74.978600000000000
2006-01-01	93.361400000000000
2007-01-01	114.219000000000000
2008-01-01	88.578600000000000
2009-01-01	68.865600000000000
2010-01-01	90.713800000000000
2011-01-01	76.040300000000000
2012-01-01	59.945500000000000
2013-01-01	64.368800000000000
2014-01-01	65.662700000000000
2015-01-01	71.549700000000000
2016-01-01	72.405500000000000
2017-01-01	65.463200000000000