Year	Percent
1973-01-01	29.02690000000000
1974-01-01	32.88710000000000
1975-01-01	29.45230000000000
1976-01-01	25.65930000000000
1977-01-01	25.32530000000000
1978-01-01	24.09950000000000
1979-01-01	23.91270000000000
1980-01-01	24.68610000000000
1981-01-01	27.41610000000000
1982-01-01	31.36680000000000
1983-01-01	34.12010000000000
1984-01-01	38.42850000000000
1985-01-01	41.62840000000000
1986-01-01	58.89480000000000
1987-01-01	76.53210000000000
1988-01-01	82.67710000000000
1989-01-01	92.91210000000000
1990-01-01	100.48600000000000
1991-01-01	101.92700000000000
1992-01-01	100.46799999999999
1993-01-01	98.54930000000000
1994-01-01	97.52640000000000
1995-01-01	93.22330000000000
1996-01-01	96.45420000000000
1997-01-01	99.32150000000000
1998-01-01	100.42299999999999
1999-01-01	102.39500000000000
2000-01-01	107.48500000000000
2001-01-01	116.34600000000000
2002-01-01	120.46400000000000
2003-01-01	123.99000000000000
2004-01-01	130.50600000000000
2005-01-01	136.91800000000000
2006-01-01	144.98200000000000
2007-01-01	158.27200000000002
2008-01-01	180.60400000000000
2009-01-01	196.12500000000000
2010-01-01	187.62000000000000
2011-01-01	177.85299999999998
2012-01-01	165.46599999999998
2013-01-01	154.49500000000000
2014-01-01	141.31600000000000
2015-01-01	132.97600000000000
2016-01-01	130.47899999999998