Year	Percent
1960-01-01	93.09620000000000
1961-01-01	94.36570000000000
1962-01-01	95.81760000000000
1963-01-01	96.44640000000000
1964-01-01	96.23520000000000
1965-01-01	96.03680000000000
1966-01-01	96.77030000000000
1967-01-01	98.85900000000000
1968-01-01	98.85900000000000
1969-01-01	99.24220000000000
1970-01-01	99.89690000000000
1971-01-01	99.89690000000000
1972-01-01	99.89690000000000
1973-01-01	99.99470000000000
1974-01-01	97.73730000000000
1975-01-01	95.83130000000000
1976-01-01	96.65230000000000
1977-01-01	97.79820000000000
1978-01-01	96.97680000000000
1979-01-01	93.21450000000000
1980-01-01	89.05550000000000
1981-01-01	87.38720000000000
1982-01-01	89.19510000000000
1983-01-01	90.48990000000000
1984-01-01	90.55890000000000
1985-01-01	89.87920000000000
1986-01-01	90.94060000000000
1987-01-01	92.08180000000000
1988-01-01	92.04110000000000
1989-01-01	94.42100000000000
1990-01-01	94.97330000000000
1991-01-01	93.47240000000000
1992-01-01	91.52090000000000
1993-01-01	90.88260000000000
1994-01-01	92.10570000000000
1995-01-01	91.34490000000000
1996-01-01	91.15560000000000
1997-01-01	92.45980000000000
1998-01-01	93.01390000000000
1999-01-01	93.91990000000000
2000-01-01	93.81380000000000
2001-01-01	93.75190000000000
2002-01-01	92.96610000000000
2003-01-01	92.41799999999999
2004-01-01	92.84510000000000
2005-01-01	93.48480000000000
2006-01-01	94.14550000000000
2007-01-01	95.00930000000000
2008-01-01	95.80280000000000
2009-01-01	99.46700000000001
2010-01-01	99.49530000000000
2011-01-01	99.51930000000000
2012-01-01	99.60320000000000
2013-01-01	99.62440000000000
2014-01-01	99.57860000000000
2015-01-01	99.48530000000000
2016-01-01	99.40230000000000