Year	Percent
1960-01-01	26.365500000000000
1961-01-01	26.731500000000000
1962-01-01	25.326300000000000
1963-01-01	25.233600000000000
1964-01-01	27.378300000000000
1965-01-01	28.305600000000000
1966-01-01	27.482800000000000
1967-01-01	26.181700000000000
1968-01-01	25.282100000000000
1969-01-01	24.114600000000000
1970-01-01	23.546999999999997
1971-01-01	26.306400000000000
1972-01-01	27.202600000000000
1973-01-01	25.245400000000000
1974-01-01	25.685600000000000
1975-01-01	26.014100000000000
1976-01-01	25.652100000000000
1977-01-01	24.542400000000000
1978-01-01	25.693000000000000
1979-01-01	26.767700000000000
1980-01-01	26.423800000000000
1981-01-01	21.812700000000000
1982-01-01	17.564800000000000
1983-01-01	17.935000000000000
1984-01-01	18.400900000000000
1985-01-01	17.839200000000000
1986-01-01	16.496800000000000
1987-01-01	17.252400000000000
1988-01-01	16.666500000000000
1989-01-01	15.412600000000000
1990-01-01	14.597400000000000
1991-01-01	10.463300000000000
1992-01-01	10.667500000000000
1993-01-01	12.442100000000000
1994-01-01	12.872800000000000
1995-01-01	11.150200000000000
1996-01-01	11.396600000000000
1997-01-01	13.163300000000000
1998-01-01	15.773000000000000
1999-01-01	19.420700000000000
2000-01-01	22.785100000000000
2001-01-01	25.667100000000000
2002-01-01	27.720900000000000
2003-01-01	28.976000000000000
2004-01-01	29.493700000000000
2005-01-01	31.429300000000000
2006-01-01	33.514200000000000
2007-01-01	37.214500000000000
2008-01-01	43.356900000000000
2009-01-01	46.222400000000000
2010-01-01	43.460100000000000
2011-01-01	43.289300000000000
2012-01-01	44.881700000000000
2013-01-01	48.098400000000000
2014-01-01	50.462600000000000
2015-01-01	53.133999999999990
2016-01-01	55.902700000000000