Year	Percent
1966-01-01	45.314200000000000
1967-01-01	45.846000000000004
1968-01-01	51.756100000000000
1969-01-01	45.028600000000000
1970-01-01	47.396700000000000
1971-01-01	47.196900000000000
1972-01-01	50.459700000000000
1973-01-01	44.706300000000000
1974-01-01	37.132500000000000
1975-01-01	28.770600000000000
1976-01-01	28.526000000000000
1977-01-01	30.653200000000000
1978-01-01	31.677900000000000
1979-01-01	32.920400000000000
1980-01-01	30.526700000000000
1981-01-01	31.985200000000000
1982-01-01	34.590100000000000
1983-01-01	35.291400000000000
1984-01-01	35.107400000000000
1985-01-01	36.725400000000000
1986-01-01	36.625200000000000
1987-01-01	37.858900000000000
1988-01-01	40.814000000000000
1989-01-01	39.841800000000000
1990-01-01	42.419300000000000
1991-01-01	45.319100000000000
1992-01-01	48.472000000000000
1993-01-01	48.032900000000000
1994-01-01	48.721300000000000
1995-01-01	49.056300000000000
1996-01-01	51.295900000000000
1997-01-01	56.864400000000000
1998-01-01	52.137100000000000
1999-01-01	53.122100000000000
2000-01-01	55.407800000000000
2001-01-01	69.703000000000000
2002-01-01	85.260400000000000
2003-01-01	91.538400000000000
2004-01-01	91.394600000000000
2005-01-01	94.282600000000000
2006-01-01	95.517500000000000
2007-01-01	101.636000000000010
2008-01-01	113.292000000000000
2009-01-01	112.169000000000000