Year	Percent
1960-01-01	36.12470000000000
1961-01-01	36.08860000000000
1962-01-01	35.04090000000000
1963-01-01	34.84080000000000
1964-01-01	35.20790000000000
1965-01-01	35.10870000000000
1966-01-01	37.76970000000000
1967-01-01	42.38720000000000
1968-01-01	44.34380000000000
1969-01-01	44.79500000000000
1970-01-01	45.82090000000000
1971-01-01	45.97500000000000
1972-01-01	46.21500000000000
1973-01-01	46.54500000000000
1974-01-01	46.72670000000000
1975-01-01	48.50760000000000
1976-01-01	49.38550000000000
1977-01-01	52.11980000000000
1978-01-01	54.32670000000000
1979-01-01	55.75190000000000
1980-01-01	56.84710000000000
1981-01-01	60.68670000000000
1982-01-01	67.39930000000000
1983-01-01	64.11360000000000
1984-01-01	61.45040000000000
1985-01-01	60.84380000000000
1986-01-01	62.28080000000000
1987-01-01	62.06040000000000
1988-01-01	62.78700000000000
1989-01-01	66.46620000000000
1990-01-01	70.80400000000000
1991-01-01	75.26110000000000
1992-01-01	76.20210000000000
1993-01-01	76.23330000000000
1994-01-01	73.65850000000000
1995-01-01	74.23620000000000
1996-01-01	74.64600000000000
1997-01-01	73.88000000000000
1998-01-01	73.74040000000000
1999-01-01	71.40830000000000
2000-01-01	68.76190000000000
2001-01-01	99.21050000000000
2002-01-01	126.01899999999999
2003-01-01	121.70000000000000
2004-01-01	118.60400000000000
2005-01-01	120.30600000000000
2006-01-01	126.41900000000000
2007-01-01	119.82799999999999
2008-01-01	115.60500000000000