Year	Percent
1964-01-01	13.49560000000000
1965-01-01	17.11540000000000
1966-01-01	29.37620000000000
1967-01-01	37.31250000000000
1968-01-01	32.22850000000000
1969-01-01	31.39630000000000
1970-01-01	38.17150000000000
1971-01-01	44.32540000000000
1972-01-01	39.21520000000000
1973-01-01	39.14460000000000
1974-01-01	56.46980000000000
1975-01-01	63.42020000000000
1976-01-01	49.88050000000000
1977-01-01	56.64460000000000
1978-01-01	70.41110000000000
1979-01-01	61.61700000000000
1980-01-01	60.56890000000000
1981-01-01	75.78120000000000
1982-01-01	84.03980000000000
1983-01-01	82.34910000000000
1984-01-01	81.25210000000000
1985-01-01	87.80720000000000
1986-01-01	84.04750000000000
1987-01-01	74.47120000000000
1988-01-01	75.02690000000000
1989-01-01	81.49350000000000
1990-01-01	77.21800000000000
1991-01-01	60.40330000000000
1992-01-01	55.39790000000000
1993-01-01	63.59010000000000
1994-01-01	66.94810000000000
1995-01-01	63.39750000000000
1996-01-01	61.62780000000000
1997-01-01	63.80500000000000
1998-01-01	73.80900000000000
1999-01-01	79.46340000000000
2000-01-01	78.75420000000000
2001-01-01	76.68380000000000
2002-01-01	73.06030000000000
2003-01-01	71.06310000000000
2004-01-01	71.82080000000000
2005-01-01	75.12860000000000
2006-01-01	84.32620000000000
2007-01-01	87.04100000000000
2008-01-01	93.36210000000000
2009-01-01	97.98100000000001
2010-01-01	89.37100000000001
2011-01-01	93.49130000000000
2012-01-01	106.68700000000001
2013-01-01	114.95900000000000
2014-01-01	116.05700000000000
2015-01-01	112.91300000000000
2016-01-01	110.68000000000000