Year	2011 U.S. Dollars
1960-01-01	11272
1961-01-01	11688
1962-01-01	12268
1963-01-01	12805
1964-01-01	13485
1965-01-01	14000
1966-01-01	14603
1967-01-01	15195
1968-01-01	15752
1969-01-01	16736
1970-01-01	17612
1971-01-01	18376
1972-01-01	19041
1973-01-01	20138
1974-01-01	20946
1975-01-01	20615
1976-01-01	21433
1977-01-01	22099
1978-01-01	22861
1979-01-01	23547
1980-01-01	23810
1981-01-01	23909
1982-01-01	24341
1983-01-01	24511
1984-01-01	24758
1985-01-01	25033
1986-01-01	25470
1987-01-01	25941
1988-01-01	26999
1989-01-01	27966
1990-01-01	28546
1991-01-01	28700
1992-01-01	28983
1993-01-01	28668
1994-01-01	29206
1995-01-01	29699
1996-01-01	29913
1997-01-01	30461
1998-01-01	31376
1999-01-01	32246
2000-01-01	33207
2001-01-01	33574
2002-01-01	33643
2003-01-01	33709
2004-01-01	34316
2005-01-01	34683
2006-01-01	35295
2007-01-01	35882
2008-01-01	35656
2009-01-01	34351
2010-01-01	34734
2011-01-01	35133