Year	Percent
1975-01-01	38.553000000000004
1976-01-01	33.058800000000000
1977-01-01	33.816200000000000
1978-01-01	36.044100000000000
1979-01-01	34.552900000000000
1980-01-01	36.220800000000000
1981-01-01	38.025000000000000
1982-01-01	44.135000000000000
1983-01-01	43.719900000000000
1984-01-01	37.993400000000000
1985-01-01	36.655000000000000
1986-01-01	33.052600000000000
1987-01-01	34.021600000000000
1988-01-01	35.313300000000000
1989-01-01	40.892900000000000
1990-01-01	41.446999999999996
1991-01-01	42.646700000000000
1992-01-01	42.218999999999994
1993-01-01	47.080200000000000
1994-01-01	49.971100000000000
1995-01-01	50.923400000000000
1996-01-01	55.262600000000000
1997-01-01	60.242700000000000
1998-01-01	60.218800000000000
1999-01-01	61.746100000000000
2000-01-01	66.020500000000000
2001-01-01	73.265600000000000
2002-01-01	72.273100000000000
2003-01-01	65.243800000000000
2004-01-01	62.174900000000000
2005-01-01	65.813400000000000
2006-01-01	69.970600000000000
2007-01-01	78.539000000000000
2008-01-01	94.122300000000000
2009-01-01	101.945000000000000
2010-01-01	98.246000000000010
2011-01-01	95.398400000000000
2012-01-01	99.495500000000000
2013-01-01	98.791600000000000
2014-01-01	93.736900000000000
2015-01-01	80.696700000000000
2016-01-01	73.555600000000000