Year	Percent
1960-01-01	79.19320000000000
1961-01-01	73.61770000000000
1962-01-01	68.80530000000000
1963-01-01	69.70180000000000
1964-01-01	70.15790000000000
1965-01-01	71.56850000000000
1966-01-01	73.01290000000000
1967-01-01	74.16890000000000
1968-01-01	75.78930000000000
1969-01-01	77.44730000000000
1970-01-01	79.66040000000000
1971-01-01	79.35980000000000
1972-01-01	78.89380000000000
1973-01-01	81.66830000000000
1974-01-01	82.82840000000000
1975-01-01	80.72790000000000
1976-01-01	78.70850000000000
1977-01-01	74.59460000000000
1978-01-01	69.72040000000000
1979-01-01	65.98120000000000
1980-01-01	61.09990000000000
1981-01-01	60.65160000000000
1982-01-01	64.08520000000000
1983-01-01	67.28520000000000
1984-01-01	62.89920000000000
1985-01-01	59.06580000000000
1986-01-01	68.65340000000000
1987-01-01	80.11390000000000
1988-01-01	84.47440000000000
1989-01-01	88.48140000000000
1990-01-01	92.64150000000000
1991-01-01	92.20770000000000
1992-01-01	87.49760000000000
1993-01-01	83.99540000000000
1994-01-01	81.98899999999999
1995-01-01	80.07510000000000
1996-01-01	83.30180000000000
1997-01-01	89.14110000000000
1998-01-01	94.12490000000000
1999-01-01	97.08050000000000
2000-01-01	97.81060000000000
2001-01-01	85.11230000000000
2002-01-01	78.32550000000000
2003-01-01	84.40840000000000
2004-01-01	88.54960000000000
2005-01-01	92.40470000000000
2006-01-01	94.49460000000000
2007-01-01	95.59140000000000
2008-01-01	96.79600000000000
2009-01-01	97.84490000000000
2010-01-01	98.47490000000000
2011-01-01	98.76299999999999
2012-01-01	98.89170000000000
2013-01-01	99.00810000000000
2014-01-01	99.12720000000000
2015-01-01	99.23880000000000
2016-01-01	99.20170000000000