Year	Percent
1960-01-01	8.514439999999999
1961-01-01	8.824090000000000
1962-01-01	9.759839999999999
1963-01-01	10.884100000000000
1964-01-01	11.586900000000000
1965-01-01	11.998800000000000
1966-01-01	12.899300000000000
1967-01-01	14.303700000000000
1968-01-01	15.618400000000000
1969-01-01	16.292600000000000
1970-01-01	16.681700000000000
1971-01-01	17.396100000000000
1972-01-01	18.184900000000000
1973-01-01	19.095700000000000
1974-01-01	18.916000000000000
1975-01-01	19.816500000000000
1976-01-01	20.410400000000000
1977-01-01	21.973400000000000
1978-01-01	23.229600000000000
1979-01-01	24.825300000000000
1980-01-01	26.032300000000000
1981-01-01	26.577800000000000
1982-01-01	25.605800000000000
1983-01-01	25.117500000000000
1984-01-01	24.862900000000000
1985-01-01	24.693500000000000
1986-01-01	24.694600000000000
1987-01-01	26.311000000000000
1988-01-01	28.168000000000003
1989-01-01	31.792800000000000
1990-01-01	34.257000000000000
1991-01-01	35.102000000000000
1992-01-01	54.782700000000000
1993-01-01	73.805300000000000
1994-01-01	71.828200000000000
1995-01-01	70.971200000000000
1996-01-01	72.022300000000000
1997-01-01	72.260800000000000
1998-01-01	72.260800000000000
1999-01-01	72.260800000000000
2000-01-01	77.339200000000000
2001-01-01	65.612200000000000
2002-01-01	64.004800000000000
2003-01-01	62.415200000000000
2004-01-01	60.496700000000000
2005-01-01	61.567200000000000
2006-01-01	63.122800000000000
2007-01-01	64.982600000000000
2008-01-01	65.298200000000000
2009-01-01	60.718000000000000
2010-01-01	56.304100000000000
2011-01-01	55.024100000000000
2012-01-01	54.484600000000000
2013-01-01	55.241800000000000
2014-01-01	56.954400000000000
2015-01-01	59.307900000000000
2016-01-01	62.047900000000000