Year	2011 U.S. Dollars
1960-01-01	16574
1961-01-01	17452
1962-01-01	17778
1963-01-01	18312
1964-01-01	19085
1965-01-01	19938
1966-01-01	20525
1967-01-01	21623
1968-01-01	21920
1969-01-01	22718
1970-01-01	23013
1971-01-01	24146
1972-01-01	25224
1973-01-01	26169
1974-01-01	27001
1975-01-01	28201
1976-01-01	29695
1977-01-01	30794
1978-01-01	31859
1979-01-01	33135
1980-01-01	34516
1981-01-01	34930
1982-01-01	34845
1983-01-01	36073
1984-01-01	38091
1985-01-01	40011
1986-01-01	41478
1987-01-01	42019
1988-01-01	41722
1989-01-01	41964
1990-01-01	42626
1991-01-01	43741
1992-01-01	45021
1993-01-01	46001
1994-01-01	48050
1995-01-01	49803
1996-01-01	52078
1997-01-01	54589
1998-01-01	55721
1999-01-01	56462
2000-01-01	57922
2001-01-01	58776
2002-01-01	59338
2003-01-01	59572
2004-01-01	61566
2005-01-01	62731
2006-01-01	63754
2007-01-01	64772
2008-01-01	63992
2009-01-01	62137
2010-01-01	61782
2011-01-01	61869