Year	Percent
1975-01-01	33.999600000000000
1976-01-01	36.210600000000000
1977-01-01	37.800400000000000
1978-01-01	36.675700000000000
1979-01-01	36.198100000000000
1980-01-01	36.671700000000000
1981-01-01	37.089200000000000
1982-01-01	33.844500000000000
1983-01-01	36.728900000000000
1984-01-01	40.509600000000000
1985-01-01	44.338900000000000
1986-01-01	54.741900000000000
1987-01-01	52.894300000000000
1988-01-01	40.410300000000000
1989-01-01	34.595500000000000
1990-01-01	33.313500000000000
1991-01-01	34.566900000000000
1992-01-01	37.756100000000000
1993-01-01	40.061300000000000
1994-01-01	41.493200000000000
1995-01-01	42.503800000000000
1996-01-01	41.814100000000000
1997-01-01	43.619500000000000
1998-01-01	50.221600000000000
1999-01-01	52.785500000000000
2000-01-01	48.916100000000000
2001-01-01	48.916100000000000
2002-01-01	48.916100000000000
2003-01-01	48.916100000000000
2004-01-01	54.086999999999996
2005-01-01	48.991000000000010
2006-01-01	49.621900000000000
2007-01-01	53.612300000000000
2008-01-01	61.101200000000000
2009-01-01	82.428900000000000
2010-01-01	80.518999999999990
2011-01-01	81.769700000000000
2012-01-01	87.106600000000000
2013-01-01	90.790700000000000
2014-01-01	92.607900000000000
2015-01-01	103.032000000000010