Year	Percent
1960-01-01	32.777700000000000
1961-01-01	31.802600000000000
1962-01-01	33.543300000000000
1963-01-01	33.314800000000000
1964-01-01	33.790200000000000
1965-01-01	36.186300000000000
1966-01-01	37.858500000000000
1967-01-01	40.010999999999996
1968-01-01	40.184900000000000
1969-01-01	41.212100000000000
1970-01-01	41.928900000000000
1971-01-01	43.663600000000000
1972-01-01	45.669000000000000
1973-01-01	46.457600000000000
1974-01-01	46.557900000000000
1975-01-01	49.699500000000000
1976-01-01	52.504200000000000
1977-01-01	56.330400000000000
1978-01-01	60.731200000000000
1979-01-01	63.637400000000000
1980-01-01	68.042200000000000
1981-01-01	71.214400000000000
1982-01-01	72.125800000000000
1983-01-01	71.702800000000000
1984-01-01	72.372100000000000
1985-01-01	74.755300000000000
1986-01-01	76.460500000000000
1987-01-01	76.199500000000000
1988-01-01	78.885000000000000
1989-01-01	81.698500000000000
1990-01-01	84.892900000000000
1991-01-01	87.095500000000000
1992-01-01	88.685900000000000
1993-01-01	90.174800000000000
1994-01-01	89.093900000000000
1995-01-01	89.610900000000000
1996-01-01	92.329800000000000
1997-01-01	95.908100000000000
1998-01-01	95.908100000000000
1999-01-01	95.908100000000000
2000-01-01	98.345100000000000
2001-01-01	88.749400000000000
2002-01-01	87.687999999999990
2003-01-01	86.850700000000000
2004-01-01	85.586500000000000
2005-01-01	88.841300000000000
2006-01-01	91.805900000000000
2007-01-01	90.499300000000000
2008-01-01	93.000300000000000
2009-01-01	97.288100000000000
2010-01-01	96.518500000000000
2011-01-01	95.228500000000000
2012-01-01	93.591000000000010
2013-01-01	92.036900000000000
2014-01-01	88.360300000000000
2015-01-01	84.693700000000000
2016-01-01	83.146400000000000