Year	Percent
1976-01-01	43.344200000000000
1977-01-01	42.322800000000000
1978-01-01	47.031400000000000
1979-01-01	50.479900000000000
1980-01-01	52.060900000000000
1981-01-01	62.079500000000000
1982-01-01	52.417400000000000
1983-01-01	43.413000000000004
1984-01-01	41.030800000000000
1985-01-01	35.706600000000000
1986-01-01	29.415600000000000
1987-01-01	29.429100000000000
1988-01-01	33.282000000000000
1989-01-01	28.266500000000000
1990-01-01	26.193200000000000
1991-01-01	28.428900000000000
1992-01-01	33.112800000000000
1993-01-01	37.210200000000000
1994-01-01	37.576300000000000
1995-01-01	35.889900000000000
1996-01-01	33.299900000000000
1997-01-01	32.652900000000000
1998-01-01	32.256800000000000
1999-01-01	36.312300000000000
2000-01-01	38.671100000000000
2001-01-01	36.495200000000000
2002-01-01	38.285500000000000
2003-01-01	42.319500000000000
2004-01-01	44.686800000000000
2005-01-01	45.666800000000000
2006-01-01	47.265300000000000
2007-01-01	47.118700000000000
2008-01-01	52.574500000000000
2009-01-01	65.433500000000000
2010-01-01	78.100500000000000
2011-01-01	87.361600000000000
2012-01-01	94.187200000000000
2013-01-01	101.966000000000010
2014-01-01	106.794000000000000
2015-01-01	102.260000000000000
2016-01-01	93.735600000000000