Year	Percent
1960-01-01	86.35030000000000
1961-01-01	87.73090000000000
1962-01-01	87.79880000000000
1963-01-01	82.96560000000000
1964-01-01	74.26810000000000
1965-01-01	69.66220000000000
1966-01-01	69.81700000000000
1967-01-01	67.20560000000000
1968-01-01	64.08950000000000
1969-01-01	62.11610000000000
1970-01-01	60.28990000000000
1971-01-01	61.67910000000000
1972-01-01	63.68480000000000
1973-01-01	64.36800000000000
1974-01-01	67.91950000000000
1975-01-01	69.69490000000000
1976-01-01	68.42260000000000
1977-01-01	67.02890000000000
1978-01-01	66.27199999999999
1979-01-01	65.63710000000000
1980-01-01	64.62850000000000
1981-01-01	63.44330000000000
1982-01-01	62.91980000000000
1983-01-01	62.86820000000000
1984-01-01	62.78450000000000
1985-01-01	63.64970000000000
1986-01-01	58.84300000000000
1987-01-01	54.21960000000000
1988-01-01	57.04060000000000
1989-01-01	58.83520000000000
1990-01-01	69.06570000000000
1991-01-01	75.49620000000000
1992-01-01	80.37320000000000
1993-01-01	85.27380000000000
1994-01-01	86.91200000000000
1995-01-01	85.14730000000000
1996-01-01	82.97910000000000
1997-01-01	86.17040000000000
1998-01-01	88.70890000000000
1999-01-01	90.49880000000000
2000-01-01	91.64540000000000
2001-01-01	93.13010000000000
2002-01-01	94.74710000000000
2003-01-01	94.67790000000000
2004-01-01	94.62210000000000
2005-01-01	95.50920000000000
2006-01-01	96.44910000000000
2007-01-01	97.08920000000000
2008-01-01	97.73960000000000
2009-01-01	98.26370000000000
2010-01-01	98.64240000000000
2011-01-01	98.92520000000000
2012-01-01	99.19670000000000
2013-01-01	99.26650000000000
2014-01-01	99.31140000000000
2015-01-01	99.35799999999999
2016-01-01	99.35370000000000