Year	Percent
1960-01-01	55.86820000000000
1961-01-01	54.53090000000000
1962-01-01	55.60390000000000
1963-01-01	57.04990000000000
1964-01-01	57.31840000000000
1965-01-01	61.49570000000000
1966-01-01	68.06380000000000
1967-01-01	71.75480000000000
1968-01-01	72.27070000000000
1969-01-01	74.10770000000000
1970-01-01	75.01260000000000
1971-01-01	76.41100000000000
1972-01-01	81.41030000000000
1973-01-01	84.50340000000000
1974-01-01	85.96620000000000
1975-01-01	87.11450000000000
1976-01-01	87.94480000000000
1977-01-01	89.90380000000000
1978-01-01	93.35670000000000
1979-01-01	95.94990000000000
1980-01-01	97.34260000000000
1981-01-01	102.59600000000000
1982-01-01	104.87700000000001
1983-01-01	102.42700000000000
1984-01-01	102.33100000000000
1985-01-01	104.10400000000000
1986-01-01	103.53600000000000
1987-01-01	102.91300000000000
1988-01-01	103.96400000000000
1989-01-01	103.74900000000000
1990-01-01	103.46300000000000
1991-01-01	103.40700000000001
1992-01-01	102.35000000000000
1993-01-01	101.94700000000000
1994-01-01	102.63900000000000
1995-01-01	102.30600000000000
1996-01-01	104.63900000000000
1997-01-01	110.04700000000001
1998-01-01	112.24100000000000
1999-01-01	111.36200000000001
2000-01-01	109.66600000000000
2001-01-01	89.56700000000001
2002-01-01	80.61920000000000
2003-01-01	80.30810000000000
2004-01-01	81.68820000000000
2005-01-01	83.69770000000000
2006-01-01	85.83100000000000
2007-01-01	98.32390000000000
2008-01-01	108.82300000000000