Year	Percent
1960-01-01	78.92710000000000
1961-01-01	79.77910000000000
1962-01-01	80.81260000000000
1963-01-01	82.37040000000000
1964-01-01	84.21640000000000
1965-01-01	83.40740000000000
1966-01-01	82.19130000000000
1967-01-01	82.59200000000001
1968-01-01	80.89520000000000
1969-01-01	78.91640000000000
1970-01-01	78.99120000000000
1971-01-01	80.76680000000000
1972-01-01	82.74490000000000
1973-01-01	83.76240000000000
1974-01-01	83.68020000000000
1975-01-01	82.03190000000000
1976-01-01	77.98690000000000
1977-01-01	76.20030000000000
1978-01-01	78.36550000000000
1979-01-01	76.62150000000000
1980-01-01	71.94390000000000
1981-01-01	67.26670000000000
1982-01-01	63.65060000000000
1983-01-01	64.28570000000000
1984-01-01	67.67100000000000
1985-01-01	80.86230000000000
1986-01-01	93.56710000000000
1987-01-01	95.89780000000000
1988-01-01	98.57480000000000
1989-01-01	98.41070000000000
1990-01-01	97.98240000000000
1991-01-01	97.13770000000000
1992-01-01	97.34750000000000
1993-01-01	97.88420000000000
1994-01-01	96.07820000000000
1995-01-01	95.48810000000000
1996-01-01	95.61360000000000
1997-01-01	95.44590000000000
1998-01-01	96.18840000000000
1999-01-01	96.54240000000000
2000-01-01	98.57830000000000
2001-01-01	99.12120000000000
2002-01-01	99.13940000000000
2003-01-01	99.19840000000000
2004-01-01	99.30150000000000
2005-01-01	99.49570000000000
2006-01-01	99.62920000000000
2007-01-01	99.75420000000000
2008-01-01	99.88010000000000
2009-01-01	99.91260000000000
2010-01-01	99.94600000000000
2011-01-01	99.97399999999999
2012-01-01	99.97980000000000
2013-01-01	99.98260000000000
2014-01-01	99.99130000000000
2015-01-01	99.99610000000000
2016-01-01	99.99740000000000