Year	Percent
1962-01-01	94.39250000000000
1963-01-01	96.51570000000000
1964-01-01	97.07720000000000
1965-01-01	95.91000000000000
1966-01-01	90.79630000000000
1967-01-01	86.23050000000000
1968-01-01	85.51840000000000
1969-01-01	84.96860000000000
1970-01-01	89.36950000000000
1971-01-01	96.85440000000000
1972-01-01	95.62600000000000
1973-01-01	91.39260000000000
1974-01-01	91.83760000000000
1975-01-01	95.86040000000000
1976-01-01	98.06950000000000
1977-01-01	99.38770000000000
1978-01-01	97.30710000000000
1979-01-01	93.27530000000000
1980-01-01	92.55460000000000
1981-01-01	92.40040000000000
1982-01-01	92.41330000000000
1983-01-01	91.76470000000000
1984-01-01	89.84190000000000
1985-01-01	90.30910000000000
1986-01-01	90.53350000000000
1987-01-01	89.45050000000000
1988-01-01	89.70890000000000
1989-01-01	87.59720000000000
1990-01-01	81.91300000000000
1991-01-01	75.99040000000000
1992-01-01	74.41590000000000
1993-01-01	74.34880000000000
1994-01-01	78.56590000000000
1995-01-01	77.43930000000000
1996-01-01	75.93250000000000
1997-01-01	72.06040000000000
1998-01-01	68.66310000000000
1999-01-01	75.30470000000000
2000-01-01	79.36320000000000
2001-01-01	81.84590000000000
2002-01-01	84.30490000000000
2003-01-01	87.85730000000000
2004-01-01	90.17370000000000
2005-01-01	91.77880000000000
2006-01-01	95.99600000000001
2007-01-01	99.28040000000000
2008-01-01	98.72610000000000
2009-01-01	96.16950000000000
2010-01-01	94.11610000000000
2011-01-01	93.50570000000000
2012-01-01	92.78410000000000
2013-01-01	92.66840000000000
2014-01-01	93.22790000000000
2015-01-01	94.05020000000000
2016-01-01	94.88910000000000