Year	Percent
1960-01-01	48.222700000000000
1961-01-01	46.885800000000000
1962-01-01	47.144900000000000
1963-01-01	46.350800000000000
1964-01-01	43.349400000000000
1965-01-01	43.035900000000000
1966-01-01	43.778800000000000
1967-01-01	44.008300000000000
1968-01-01	44.330300000000000
1969-01-01	43.994100000000000
1970-01-01	41.093900000000000
1971-01-01	42.116600000000000
1972-01-01	42.192900000000000
1973-01-01	42.017200000000000
1974-01-01	46.508600000000000
1975-01-01	46.854800000000000
1976-01-01	45.622600000000000
1977-01-01	42.226000000000006
1978-01-01	43.477100000000000
1979-01-01	45.992300000000000
1980-01-01	47.308200000000000
1981-01-01	47.340800000000000
1982-01-01	43.190400000000000
1983-01-01	38.992300000000000
1984-01-01	38.185400000000000
1985-01-01	38.086000000000000
1986-01-01	36.454400000000000
1987-01-01	35.632500000000000
1988-01-01	35.453200000000000
1989-01-01	33.572800000000000
1990-01-01	34.472800000000000
1991-01-01	36.920500000000000
1992-01-01	36.992600000000000
1993-01-01	39.857900000000000
1994-01-01	43.587200000000000
1995-01-01	51.929100000000000
1996-01-01	62.463700000000000
1997-01-01	63.846000000000004
1998-01-01	65.800900000000000
1999-01-01	69.219600000000000
2000-01-01	71.588200000000000
2001-01-01	67.608300000000000
2002-01-01	64.581400000000000
2003-01-01	67.251400000000000
2004-01-01	70.278300000000000
2005-01-01	72.673300000000000
2006-01-01	81.713800000000000
2007-01-01	91.587000000000000
2008-01-01	101.895000000000000
2009-01-01	108.589000000000000
2010-01-01	106.634000000000000
2011-01-01	98.465900000000000
2012-01-01	94.340000000000000
2013-01-01	95.348000000000000
2014-01-01	89.727600000000000
2015-01-01	68.296900000000000
2016-01-01	71.212600000000000