Year	2011 U.S. Dollars
1960-01-01	37876
1961-01-01	37578
1962-01-01	38753
1963-01-01	39954
1964-01-01	41168
1965-01-01	41799
1966-01-01	41245
1967-01-01	43014
1968-01-01	44271
1969-01-01	46210
1970-01-01	47317
1971-01-01	48001
1972-01-01	48322
1973-01-01	49132
1974-01-01	49386
1975-01-01	50564
1976-01-01	51952
1977-01-01	52009
1978-01-01	53108
1979-01-01	54218
1980-01-01	54320
1981-01-01	55430
1982-01-01	55484
1983-01-01	56282
1984-01-01	57999
1985-01-01	59379
1986-01-01	58393
1987-01-01	59953
1988-01-01	60281
1989-01-01	60370
1990-01-01	60209
1991-01-01	61099
1992-01-01	63018
1993-01-01	65245
1994-01-01	66290
1995-01-01	65954
1996-01-01	67745
1997-01-01	69881
1998-01-01	71749
1999-01-01	73540
2000-01-01	73969
2001-01-01	75003
2002-01-01	76433
2003-01-01	77125
2004-01-01	78774
2005-01-01	78498
2006-01-01	78651
2007-01-01	79803
2008-01-01	79547
2009-01-01	80038
2010-01-01	79884
2011-01-01	80330