Year	Percent
1960-01-01	39.31350000000000
1961-01-01	38.00930000000000
1962-01-01	36.73010000000000
1963-01-01	35.50920000000000
1964-01-01	34.84000000000000
1965-01-01	34.44890000000000
1966-01-01	34.04190000000000
1967-01-01	34.35090000000000
1968-01-01	34.28630000000000
1969-01-01	33.39480000000000
1970-01-01	31.64370000000000
1971-01-01	31.80350000000000
1972-01-01	33.94260000000000
1973-01-01	37.52510000000000
1974-01-01	40.49250000000000
1975-01-01	36.69440000000000
1976-01-01	32.83530000000000
1977-01-01	31.76320000000000
1978-01-01	30.08720000000000
1979-01-01	29.03500000000000
1980-01-01	29.01840000000000
1981-01-01	31.49240000000000
1982-01-01	34.23200000000000
1983-01-01	34.71170000000000
1984-01-01	35.84630000000000
1985-01-01	36.65710000000000
1986-01-01	39.41440000000000
1987-01-01	56.52450000000000
1988-01-01	71.55610000000000
1989-01-01	76.65660000000000
1990-01-01	81.50830000000000
1991-01-01	82.19330000000000
1992-01-01	68.15240000000000
1993-01-01	55.06280000000000
1994-01-01	55.40300000000000
1995-01-01	55.75820000000000
1996-01-01	61.13560000000000
1997-01-01	69.96300000000001
1998-01-01	82.37420000000000
1999-01-01	88.59800000000000
2000-01-01	90.11900000000000
2001-01-01	96.00930000000000
2002-01-01	97.80780000000000
2003-01-01	99.21110000000000
2004-01-01	103.71100000000000
2005-01-01	109.90600000000000
2006-01-01	118.66400000000000
2007-01-01	129.74100000000000
2008-01-01	149.33000000000000
2009-01-01	165.22600000000000
2010-01-01	162.87900000000000
2011-01-01	157.76500000000000
2012-01-01	149.47299999999998
2013-01-01	145.93700000000000
2014-01-01	139.07399999999998
2015-01-01	134.52600000000000
2016-01-01	136.15100000000000