Year	2011 U.S. Dollars
1960-01-01	14244
1961-01-01	14463
1962-01-01	14875
1963-01-01	15157
1964-01-01	16242
1965-01-01	16869
1966-01-01	17116
1967-01-01	17820
1968-01-01	18821
1969-01-01	19871
1970-01-01	20834
1971-01-01	21466
1972-01-01	21998
1973-01-01	23009
1974-01-01	23616
1975-01-01	23414
1976-01-01	24257
1977-01-01	24719
1978-01-01	25235
1979-01-01	25569
1980-01-01	25703
1981-01-01	25325
1982-01-01	24897
1983-01-01	25313
1984-01-01	25989
1985-01-01	26540
1986-01-01	27131
1987-01-01	27472
1988-01-01	28233
1989-01-01	29310
1990-01-01	30330
1991-01-01	30820
1992-01-01	31110
1993-01-01	31279
1994-01-01	32015
1995-01-01	32844
1996-01-01	33818
1997-01-01	35082
1998-01-01	36236
1999-01-01	37679
2000-01-01	38886
2001-01-01	39336
2002-01-01	39112
2003-01-01	39059
2004-01-01	39803
2005-01-01	40515
2006-01-01	41816
2007-01-01	43360
2008-01-01	43971
2009-01-01	42143
2010-01-01	42610
2011-01-01	42824