Year	Percent
1960-01-01	69.81130000000000
1961-01-01	71.91310000000000
1962-01-01	76.34380000000000
1963-01-01	77.38920000000000
1964-01-01	75.20170000000000
1965-01-01	78.17930000000000
1966-01-01	78.73670000000000
1967-01-01	76.73630000000000
1968-01-01	75.68310000000000
1969-01-01	76.01780000000000
1970-01-01	78.97520000000000
1971-01-01	81.40820000000000
1972-01-01	84.16660000000000
1973-01-01	86.98480000000000
1974-01-01	88.77520000000000
1975-01-01	90.71550000000000
1976-01-01	93.18100000000000
1977-01-01	94.88490000000000
1978-01-01	94.40540000000000
1979-01-01	93.08780000000000
1980-01-01	85.12360000000000
1981-01-01	79.10230000000000
1982-01-01	80.83460000000000
1983-01-01	71.76740000000000
1984-01-01	70.32750000000000
1985-01-01	82.64290000000000
1986-01-01	89.03840000000000
1987-01-01	79.71840000000000
1988-01-01	75.81990000000000
1989-01-01	93.13000000000000
1990-01-01	97.84550000000000
1991-01-01	97.23420000000000
1992-01-01	97.09730000000000
1993-01-01	98.86440000000000
1994-01-01	97.41440000000000
1995-01-01	96.57710000000000
1996-01-01	97.56690000000000
1997-01-01	98.27060000000000
1998-01-01	98.65320000000000
1999-01-01	98.90510000000000
2000-01-01	99.10930000000000
2001-01-01	99.20480000000000
2002-01-01	99.25690000000000
2003-01-01	99.40299999999999
2004-01-01	99.70710000000000
2005-01-01	99.96140000000000
2006-01-01	100.00000000000000
2007-01-01	100.00000000000000
2008-01-01	100.00000000000000
2009-01-01	100.00000000000000
2010-01-01	100.00000000000000
2011-01-01	100.00000000000000
2012-01-01	99.74220000000000
2013-01-01	99.39560000000000
2014-01-01	99.22260000000000
2015-01-01	99.09060000000000
2016-01-01	99.06090000000000