Year	Percent
1960-01-01	11.574400000000000
1961-01-01	10.972500000000000
1962-01-01	11.289100000000000
1963-01-01	11.553600000000000
1964-01-01	12.687999999999999
1965-01-01	14.277100000000000
1966-01-01	16.074500000000000
1967-01-01	17.738600000000000
1968-01-01	20.171800000000000
1969-01-01	22.355700000000000
1970-01-01	24.016400000000000
1971-01-01	28.807600000000000
1972-01-01	35.922200000000000
1973-01-01	40.571300000000000
1974-01-01	48.400500000000000
1975-01-01	51.980000000000000
1976-01-01	52.245400000000000
1977-01-01	51.535400000000000
1978-01-01	46.397400000000000
1979-01-01	46.610100000000000
1980-01-01	45.174500000000000
1981-01-01	47.063200000000000
1982-01-01	46.797800000000000
1983-01-01	45.482100000000000
1984-01-01	44.073200000000000
1985-01-01	43.078999999999990
1986-01-01	43.342700000000000
1987-01-01	45.187600000000000
1988-01-01	47.465400000000000
1989-01-01	41.799600000000000
1990-01-01	39.042900000000000
1991-01-01	40.562800000000000
1992-01-01	44.588900000000000
1993-01-01	50.561400000000000
1994-01-01	57.589400000000000
1995-01-01	65.355200000000000
1996-01-01	61.436400000000000
1997-01-01	63.819400000000000
1998-01-01	70.420800000000000
1999-01-01	80.341600000000000
2000-01-01	87.984900000000000
2001-01-01	91.912800000000000
2002-01-01	84.643900000000000
2003-01-01	73.330300000000000
2004-01-01	68.901600000000000
2005-01-01	70.806400000000000
2006-01-01	72.593800000000000
2007-01-01	72.737200000000000
2008-01-01	74.375100000000000
2009-01-01	73.162800000000000
2010-01-01	72.724700000000000
2011-01-01	70.603000000000010
2012-01-01	70.445800000000000
2013-01-01	64.215400000000000
2014-01-01	66.602300000000000
2015-01-01	76.895300000000000
2016-01-01	79.846900000000000