Year	Percent
1960-01-01	107.709000000000000
1961-01-01	105.190000000000000
1962-01-01	104.060000000000000
1963-01-01	97.776700000000000
1964-01-01	90.354400000000000
1965-01-01	92.363999999999990
1966-01-01	95.589000000000000
1967-01-01	93.241700000000000
1968-01-01	91.874900000000000
1969-01-01	90.724200000000000
1970-01-01	90.024100000000000
1971-01-01	87.748300000000000
1972-01-01	83.157100000000000
1973-01-01	83.689800000000000
1974-01-01	86.137200000000000
1975-01-01	87.297900000000000
1976-01-01	90.132500000000000
1977-01-01	88.870300000000000
1978-01-01	88.725700000000000
1979-01-01	90.253400000000000
1980-01-01	89.863500000000000
1981-01-01	87.402400000000000
1982-01-01	89.523400000000000
1983-01-01	84.196500000000000
1984-01-01	79.450400000000000
1985-01-01	81.270500000000000
1986-01-01	82.393700000000000
1987-01-01	89.337300000000000
1988-01-01	98.558500000000000
1989-01-01	90.590400000000000
1990-01-01	69.324300000000000
1991-01-01	61.297900000000000
1992-01-01	67.112000000000000
1993-01-01	67.908600000000000
1994-01-01	46.925100000000000
1995-01-01	38.272100000000000
1996-01-01	48.311900000000000
1997-01-01	66.885500000000000
1998-01-01	73.961100000000000
1999-01-01	71.222800000000000
2000-01-01	69.233100000000000
2001-01-01	71.211600000000000
2002-01-01	70.608000000000000
2003-01-01	54.413000000000004
2004-01-01	55.833200000000000
2005-01-01	65.283400000000000
2006-01-01	63.254700000000000
2007-01-01	83.343500000000000
2008-01-01	82.993500000000000
2009-01-01	79.015000000000000
2010-01-01	71.585900000000000
2011-01-01	65.471500000000000
2012-01-01	64.287800000000000
2013-01-01	62.982800000000000
2014-01-01	62.260100000000000
2015-01-01	65.238300000000000