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	40.123800000000000
1975-01-01	44.708600000000000
1976-01-01	45.583500000000000
1977-01-01	53.859600000000000
1978-01-01	62.417700000000000
1979-01-01	64.811500000000000
1980-01-01	66.511700000000000
1981-01-01	73.015600000000000
1982-01-01	81.284200000000000
1983-01-01	75.550700000000000
1984-01-01	72.481700000000000
1985-01-01	73.111000000000000
1986-01-01	75.027100000000000
1987-01-01	74.816900000000000
1988-01-01	76.345100000000000
1989-01-01	80.738800000000000
1990-01-01	86.100700000000000
1991-01-01	91.672500000000000
1992-01-01	91.988700000000000
1993-01-01	91.457700000000000
1994-01-01	88.569500000000000
1995-01-01	88.885000000000000
1996-01-01	91.214200000000000
1997-01-01	94.797800000000000
1998-01-01	96.977100000000000
1999-01-01	94.431800000000000
2000-01-01	91.077200000000000
2001-01-01	132.618000000000000
2002-01-01	168.270000000000000
2003-01-01	161.826000000000000
2004-01-01	159.043999999999980
2005-01-01	164.470999999999980
2006-01-01	177.310000000000000
2007-01-01	152.801000000000020
2008-01-01	122.694000000000000