Year	2011 U.S. Dollars
1960-01-01	11741
1961-01-01	12285
1962-01-01	12874
1963-01-01	13335
1964-01-01	14128
1965-01-01	14498
1966-01-01	14856
1967-01-01	15346
1968-01-01	15928
1969-01-01	16938
1970-01-01	17998
1971-01-01	18625
1972-01-01	19531
1973-01-01	20620
1974-01-01	21396
1975-01-01	21017
1976-01-01	22149
1977-01-01	22227
1978-01-01	22813
1979-01-01	23279
1980-01-01	24257
1981-01-01	24189
1982-01-01	24339
1983-01-01	24418
1984-01-01	25020
1985-01-01	25426
1986-01-01	25880
1987-01-01	26454
1988-01-01	27615
1989-01-01	28470
1990-01-01	29276
1991-01-01	29702
1992-01-01	30036
1993-01-01	29630
1994-01-01	30491
1995-01-01	31122
1996-01-01	31505
1997-01-01	32603
1998-01-01	33160
1999-01-01	34255
2000-01-01	35427
2001-01-01	35590
2002-01-01	35913
2003-01-01	36053
2004-01-01	37068
2005-01-01	37513
2006-01-01	38279
2007-01-01	39108
2008-01-01	39177
2009-01-01	37775
2010-01-01	38269
2011-01-01	38767