Year	Percent
1964-01-01	83.18750000000000
1965-01-01	83.40190000000000
1966-01-01	86.00210000000000
1967-01-01	88.87700000000001
1968-01-01	79.84670000000000
1969-01-01	78.82480000000000
1970-01-01	82.13110000000000
1971-01-01	88.36820000000000
1972-01-01	91.58050000000000
1973-01-01	99.36580000000000
1974-01-01	99.36580000000000
1975-01-01	99.36580000000000
1976-01-01	266.41600000000000
1977-01-01	155.71700000000000
1978-01-01	179.32200000000000
1979-01-01	175.23500000000000
1980-01-01	181.03000000000000
1981-01-01	206.02200000000002
1982-01-01	353.02000000000000
1983-01-01	353.02000000000000
1984-01-01	353.02000000000000
1985-01-01	353.02000000000000
1986-01-01	353.02000000000000
1987-01-01	353.02000000000000
1988-01-01	134.43700000000000
1989-01-01	171.84500000000000
1990-01-01	159.33900000000000
1991-01-01	112.80000000000000
1992-01-01	90.93220000000000
1993-01-01	104.61500000000000
1994-01-01	115.41900000000000
1995-01-01	117.97100000000000
1996-01-01	126.84899999999999
1997-01-01	130.95600000000002
1998-01-01	142.50799999999998
1999-01-01	161.87300000000000
2000-01-01	180.87700000000000
2001-01-01	192.55200000000002
2002-01-01	191.25799999999998
2003-01-01	204.58400000000000
2004-01-01	213.00000000000000
2005-01-01	224.59099999999998
2006-01-01	232.43099999999998
2007-01-01	240.31300000000000
2008-01-01	224.20100000000000
2009-01-01	210.07600000000000
2010-01-01	224.19600000000000
2011-01-01	236.12700000000000
2012-01-01	229.21500000000000
2013-01-01	232.21200000000002
2014-01-01	241.61200000000000
2015-01-01	242.33000000000000