Year	Percent
1960-01-01	17.855000000000000
1961-01-01	17.449100000000000
1962-01-01	17.295900000000000
1963-01-01	17.713700000000000
1964-01-01	18.123800000000000
1965-01-01	19.491800000000000
1966-01-01	23.488000000000003
1967-01-01	28.068400000000000
1968-01-01	29.681400000000000
1969-01-01	30.797100000000000
1970-01-01	31.940000000000000
1971-01-01	32.653100000000000
1972-01-01	34.907200000000000
1973-01-01	36.521000000000000
1974-01-01	37.450100000000000
1975-01-01	39.493400000000000
1976-01-01	40.733800000000000
1977-01-01	44.234100000000000
1978-01-01	48.080200000000000
1979-01-01	50.966600000000000
1980-01-01	52.956200000000000
1981-01-01	59.950200000000000
1982-01-01	68.341000000000010
1983-01-01	63.321800000000000
1984-01-01	60.514600000000000
1985-01-01	60.966900000000000
1986-01-01	62.076200000000000
1987-01-01	61.534600000000000
1988-01-01	62.917700000000000
1989-01-01	66.518100000000000
1990-01-01	70.783999999999990
1991-01-01	75.210800000000000
1992-01-01	75.312200000000000
1993-01-01	74.951600000000000
1994-01-01	72.807300000000000
1995-01-01	73.212400000000000
1996-01-01	75.443700000000000
1997-01-01	78.563200000000000
1998-01-01	79.876400000000000
1999-01-01	76.431300000000000
2000-01-01	72.555500000000000
2001-01-01	97.408800000000000
2002-01-01	118.420000000000000
2003-01-01	113.742000000000000
2004-01-01	111.634000000000000
2005-01-01	115.893999999999990
2006-01-01	125.850000000000000
2007-01-01	126.601000000000000
2008-01-01	122.694000000000000