Year	Percent
1960-01-01	83.07540000000000
1961-01-01	84.69320000000000
1962-01-01	86.41570000000000
1963-01-01	88.70190000000000
1964-01-01	90.72700000000000
1965-01-01	90.41950000000000
1966-01-01	91.08740000000000
1967-01-01	92.03820000000000
1968-01-01	91.59190000000000
1969-01-01	90.97880000000000
1970-01-01	91.73190000000000
1971-01-01	94.38190000000000
1972-01-01	97.37910000000000
1973-01-01	97.96630000000000
1974-01-01	96.75790000000000
1975-01-01	93.68530000000000
1976-01-01	89.74310000000000
1977-01-01	88.09260000000000
1978-01-01	88.73180000000000
1979-01-01	88.54590000000000
1980-01-01	88.26310000000000
1981-01-01	88.42420000000000
1982-01-01	91.01230000000000
1983-01-01	94.57970000000000
1984-01-01	94.33370000000000
1985-01-01	93.11230000000000
1986-01-01	93.03850000000000
1987-01-01	94.16490000000000
1988-01-01	96.08470000000000
1989-01-01	97.75560000000000
1990-01-01	98.34060000000000
1991-01-01	98.26280000000000
1992-01-01	96.69230000000000
1993-01-01	95.55220000000000
1994-01-01	95.96250000000000
1995-01-01	95.86320000000000
1996-01-01	94.21420000000000
1997-01-01	94.56220000000000
1998-01-01	95.70360000000000
1999-01-01	96.45870000000000
2000-01-01	97.20070000000000
2001-01-01	96.97390000000000
2002-01-01	97.01610000000000
2003-01-01	97.81080000000000
2004-01-01	98.22960000000000
2005-01-01	97.82190000000000
2006-01-01	97.23530000000000
2007-01-01	96.23780000000000
2008-01-01	94.83950000000000
2009-01-01	95.56270000000000
2010-01-01	97.37330000000000
2011-01-01	97.48140000000000
2012-01-01	97.29240000000000
2013-01-01	98.43700000000001
2014-01-01	99.61780000000000
2015-01-01	99.60770000000000
2016-01-01	99.49110000000000