Year	Percent
1960-01-01	12.141600000000000
1961-01-01	13.677900000000000
1962-01-01	14.062900000000000
1963-01-01	13.862600000000000
1964-01-01	13.142100000000000
1965-01-01	12.469300000000000
1966-01-01	12.733300000000000
1967-01-01	12.473600000000000
1968-01-01	12.724900000000000
1969-01-01	11.900300000000000
1970-01-01	9.386690000000000
1971-01-01	9.261090000000000
1972-01-01	10.056200000000000
1973-01-01	10.745800000000000
1974-01-01	10.678600000000000
1975-01-01	12.015600000000000
1976-01-01	12.554500000000000
1977-01-01	12.949600000000000
1978-01-01	13.243400000000000
1979-01-01	12.786000000000000
1980-01-01	12.011000000000000
1981-01-01	13.157000000000000
1982-01-01	13.699600000000000
1983-01-01	14.822000000000001
1984-01-01	15.338100000000000
1985-01-01	14.599000000000000
1986-01-01	14.599000000000000
1987-01-01	14.599000000000000
1988-01-01	14.599000000000000
1989-01-01	14.599000000000000
1990-01-01	13.335200000000000
1991-01-01	14.812999999999999
1992-01-01	18.505500000000000
1993-01-01	20.537600000000000
1994-01-01	20.456800000000000
1995-01-01	23.316999999999997
1996-01-01	23.170700000000000
1997-01-01	32.227100000000000
1998-01-01	39.872200000000000
1999-01-01	42.833300000000000
2000-01-01	46.470700000000000
2001-01-01	45.298200000000000
2002-01-01	45.600700000000000
2003-01-01	44.810000000000000
2004-01-01	45.553400000000000
2005-01-01	47.860400000000000
2006-01-01	50.681400000000000
2007-01-01	57.943400000000000
2008-01-01	66.066600000000000
2009-01-01	72.911600000000000
2010-01-01	70.287800000000000
2011-01-01	67.273000000000000
2012-01-01	69.661500000000000
2013-01-01	67.983400000000000
2014-01-01	66.914700000000000
2015-01-01	63.874800000000000
2016-01-01	63.171000000000010