Year	Percent
1960-01-01	42.024600000000000
1961-01-01	39.920200000000000
1962-01-01	41.255100000000000
1963-01-01	42.280700000000000
1964-01-01	44.328700000000000
1965-01-01	47.070800000000000
1966-01-01	46.684100000000000
1967-01-01	47.587100000000000
1968-01-01	50.030200000000000
1969-01-01	51.982000000000000
1970-01-01	54.585100000000000
1971-01-01	59.111999999999995
1972-01-01	62.856900000000000
1973-01-01	64.798200000000000
1974-01-01	64.240100000000000
1975-01-01	65.952500000000000
1976-01-01	65.656900000000000
1977-01-01	62.183100000000000
1978-01-01	59.429900000000000
1979-01-01	60.324200000000000
1980-01-01	61.653100000000000
1981-01-01	63.843000000000000
1982-01-01	64.780000000000000
1983-01-01	59.832200000000000
1984-01-01	53.133000000000000
1985-01-01	51.641500000000000
1986-01-01	54.733200000000000
1987-01-01	57.022500000000000
1988-01-01	55.748999999999995
1989-01-01	55.372900000000000
1990-01-01	56.111800000000000
1991-01-01	57.901000000000000
1992-01-01	58.291200000000000
1993-01-01	60.041600000000000
1994-01-01	61.231200000000000
1995-01-01	60.808600000000000
1996-01-01	59.669900000000000
1997-01-01	56.660800000000000
1998-01-01	55.411500000000000
1999-01-01	65.121900000000000
2000-01-01	74.098800000000000
2001-01-01	77.878400000000000
2002-01-01	75.916400000000000
2003-01-01	75.061300000000000
2004-01-01	74.624000000000000
2005-01-01	76.156700000000000
2006-01-01	78.918700000000000
2007-01-01	81.504900000000000
2008-01-01	91.240800000000000
2009-01-01	99.190100000000000
2010-01-01	97.206500000000000
2011-01-01	94.977500000000000
2012-01-01	95.127300000000000
2013-01-01	95.721300000000000
2014-01-01	95.318200000000000
2015-01-01	95.603900000000000
2016-01-01	96.845400000000000