Year	Percent
1960-01-01	47.763900000000000
1961-01-01	45.730700000000000
1962-01-01	44.363200000000000
1963-01-01	45.891200000000000
1964-01-01	45.004100000000000
1965-01-01	44.097800000000000
1966-01-01	43.807100000000000
1967-01-01	43.751700000000000
1968-01-01	44.043000000000000
1969-01-01	42.620700000000000
1970-01-01	41.653800000000000
1971-01-01	40.032600000000000
1972-01-01	39.112800000000000
1973-01-01	38.367300000000000
1974-01-01	38.468200000000000
1975-01-01	40.525999999999996
1976-01-01	41.616300000000000
1977-01-01	40.836200000000000
1978-01-01	39.743400000000000
1979-01-01	38.760999999999996
1980-01-01	40.056400000000000
1981-01-01	40.604600000000000
1982-01-01	39.275900000000000
1983-01-01	42.421400000000000
1984-01-01	47.101900000000000
1985-01-01	51.235000000000000
1986-01-01	54.075600000000000
1987-01-01	55.474300000000000
1988-01-01	56.706100000000000
1989-01-01	55.559000000000000
1990-01-01	55.070400000000000
1991-01-01	55.812600000000000
1992-01-01	54.798000000000000
1993-01-01	59.445400000000000
1994-01-01	57.670300000000000
1995-01-01	53.974000000000000
1996-01-01	55.142900000000000
1997-01-01	56.239100000000000
1998-01-01	57.058000000000000
1999-01-01	55.192200000000000
2000-01-01	50.140400000000000
2001-01-01	48.071100000000000
2002-01-01	48.613100000000000
2003-01-01	50.237600000000000
2004-01-01	51.970600000000000
2005-01-01	56.113400000000000
2006-01-01	59.540700000000000
2007-01-01	63.668900000000000
2008-01-01	68.220800000000000
2009-01-01	70.970500000000000
2010-01-01	67.565800000000000
2011-01-01	66.853600000000000
2012-01-01	63.862400000000000
2013-01-01	60.036100000000000
2014-01-01	59.506200000000000
2015-01-01	65.094600000000000
2016-01-01	64.359400000000000