Year	Percent
1983-01-01	15.408900000000000
1984-01-01	17.198000000000000
1985-01-01	19.579300000000000
1986-01-01	16.379100000000000
1987-01-01	16.226600000000000
1988-01-01	14.751000000000000
1989-01-01	17.677500000000000
1990-01-01	18.315300000000000
1991-01-01	22.037300000000000
1992-01-01	22.655200000000000
1993-01-01	26.722100000000000
1994-01-01	33.782900000000000
1995-01-01	40.335800000000000
1996-01-01	42.415300000000000
1997-01-01	48.619000000000000
1998-01-01	50.567500000000000
1999-01-01	36.831400000000000
2000-01-01	34.112100000000000
2001-01-01	35.166400000000000
2002-01-01	26.313300000000000
2003-01-01	25.658600000000000
2004-01-01	23.570900000000000
2005-01-01	22.949200000000000
2006-01-01	23.624300000000000
2007-01-01	20.892000000000000
2008-01-01	19.161400000000000
2009-01-01	23.528100000000000
2010-01-01	25.687700000000000
2011-01-01	23.462200000000000
2012-01-01	26.609200000000000
2013-01-01	33.242300000000000
2014-01-01	34.586999999999996
2015-01-01	34.220800000000000
2016-01-01	34.312600000000000