Year	2011 U.S. Dollars
1960-01-01	42310
1961-01-01	42986
1962-01-01	44726
1963-01-01	46032
1964-01-01	47335
1965-01-01	48569
1966-01-01	49767
1967-01-01	49664
1968-01-01	51048
1969-01-01	51982
1970-01-01	52924
1971-01-01	53779
1972-01-01	55048
1973-01-01	56030
1974-01-01	55720
1975-01-01	55708
1976-01-01	57455
1977-01-01	58433
1978-01-01	58948
1979-01-01	58643
1980-01-01	58207
1981-01-01	58541
1982-01-01	58727
1983-01-01	59893
1984-01-01	61822
1985-01-01	62800
1986-01-01	62454
1987-01-01	63398
1988-01-01	64596
1989-01-01	64830
1990-01-01	64510
1991-01-01	64284
1992-01-01	65497
1993-01-01	66712
1994-01-01	68511
1995-01-01	69203
1996-01-01	69704
1997-01-01	71145
1998-01-01	72286
1999-01-01	74412
2000-01-01	76417
2001-01-01	76837
2002-01-01	77233
2003-01-01	76858
2004-01-01	77975
2005-01-01	79318
2006-01-01	80136
2007-01-01	79976
2008-01-01	79198
2009-01-01	78242
2010-01-01	79676
2011-01-01	80357