Year	Percent
1960-01-01	70.66670000000000
1961-01-01	133.51400000000000
1962-01-01	180.15900000000002
1963-01-01	135.13500000000000
1964-01-01	130.38299999999998
1965-01-01	166.76600000000000
1966-01-01	110.62600000000000
1967-01-01	106.55100000000000
1968-01-01	141.90400000000000
1969-01-01	170.91600000000000
1970-01-01	198.28000000000000
1971-01-01	209.44200000000000
1972-01-01	209.42500000000000
1973-01-01	208.04800000000000
1974-01-01	169.54100000000000
1975-01-01	162.31100000000000
1976-01-01	173.75300000000000
1977-01-01	192.43000000000000
1978-01-01	224.60700000000000
1979-01-01	220.20400000000000
1980-01-01	203.65099999999998
1981-01-01	171.78200000000000
1982-01-01	163.85400000000000
1983-01-01	180.00200000000000
1984-01-01	183.26700000000000
1985-01-01	171.46599999999998
1986-01-01	168.98700000000000
1987-01-01	162.96800000000000
1988-01-01	165.34000000000000
1989-01-01	177.29600000000000
1990-01-01	180.98500000000000
1991-01-01	180.10700000000000
1992-01-01	180.10700000000000
1993-01-01	180.10700000000000
1994-01-01	180.10700000000000
1995-01-01	180.10700000000000
1996-01-01	180.10700000000000
1997-01-01	180.10700000000000
1998-01-01	180.10700000000000
1999-01-01	180.10700000000000
2000-01-01	180.10700000000000
2001-01-01	180.10700000000000
2002-01-01	180.10700000000000
2003-01-01	180.10700000000000
2004-01-01	180.10700000000000
2005-01-01	133.68500000000000
2006-01-01	134.96400000000000
2007-01-01	131.10900000000000
2008-01-01	129.00700000000000
2009-01-01	124.81600000000000
2010-01-01	120.61399999999999
2011-01-01	115.54000000000000
2012-01-01	112.62899999999999