Annual Percent
1960-01-01 24.274500000000000
1961-01-01 23.152300000000000
1962-01-01 21.174300000000000
1963-01-01 19.937700000000000
1964-01-01 19.387900000000000
1965-01-01 18.405500000000000
1966-01-01 18.058300000000000
1967-01-01 17.952300000000000
1968-01-01 16.860400000000000
1969-01-01 16.323500000000000
1970-01-01 16.090999999999998
1971-01-01 15.650300000000000
1972-01-01 17.313400000000000
1973-01-01 20.351300000000000
1974-01-01 21.660300000000000
1975-01-01 20.196200000000000
1976-01-01 19.613800000000000
1977-01-01 22.084100000000000
1978-01-01 23.059900000000000
1979-01-01 24.578700000000000
1980-01-01 23.882900000000000
1981-01-01 23.300500000000000
1982-01-01 23.828100000000000
1983-01-01 23.773700000000000
1984-01-01 23.583800000000000
1985-01-01 26.323300000000000
1986-01-01 29.316700000000000
1987-01-01 32.299400000000000
1988-01-01 48.073600000000000
1989-01-01 64.424400000000000
1990-01-01 67.107300000000000
1991-01-01 69.006400000000000
1992-01-01 71.151500000000000
1993-01-01 72.750700000000000
1994-01-01 72.449500000000000
1995-01-01 74.113300000000000
1996-01-01 78.071900000000000
1997-01-01 81.595900000000000
1998-01-01 81.560300000000000
1999-01-01 82.489200000000000
2000-01-01 81.635600000000000
2001-01-01 80.988300000000000
2002-01-01 78.821300000000000
2003-01-01 78.214400000000000
2004-01-01 78.195500000000000
2005-01-01 77.936900000000000
2006-01-01 81.909800000000000
2007-01-01 86.059300000000000
2008-01-01 88.426500000000000
2009-01-01 90.626400000000000
2010-01-01 91.519800000000000