Year	Percent
1960-01-01	54.87910000000000
1961-01-01	58.59000000000000
1962-01-01	60.71930000000000
1963-01-01	58.47000000000000
1964-01-01	57.09640000000000
1965-01-01	58.98030000000000
1966-01-01	61.56570000000000
1967-01-01	60.39190000000000
1968-01-01	63.35600000000000
1969-01-01	66.21250000000000
1970-01-01	68.37090000000000
1971-01-01	67.65780000000000
1972-01-01	55.89060000000000
1973-01-01	54.76390000000000
1974-01-01	65.54980000000000
1975-01-01	71.40250000000000
1976-01-01	70.61130000000000
1977-01-01	72.13820000000000
1978-01-01	72.44810000000000
1979-01-01	71.50740000000000
1980-01-01	72.61120000000000
1981-01-01	77.19550000000000
1982-01-01	79.19280000000000
1983-01-01	79.10870000000000
1984-01-01	79.46390000000000
1985-01-01	76.67040000000000
1986-01-01	79.58420000000000
1987-01-01	87.92540000000000
1988-01-01	105.62600000000000
1989-01-01	113.01600000000000
1990-01-01	109.91900000000000
1991-01-01	108.27700000000000
1992-01-01	113.08500000000000
1993-01-01	115.79700000000001
1994-01-01	116.30200000000000
1995-01-01	119.70299999999999
1996-01-01	120.30400000000000
1997-01-01	121.22500000000000
1998-01-01	127.65700000000001
1999-01-01	132.76500000000000
2000-01-01	136.83200000000000
2001-01-01	137.92000000000000
2002-01-01	136.11200000000000
2003-01-01	137.98200000000000
2004-01-01	144.58300000000000
2005-01-01	153.26600000000000
2006-01-01	158.14700000000002
2007-01-01	160.59200000000000
2008-01-01	160.67600000000002
2009-01-01	160.81600000000000
2010-01-01	159.31600000000000