Year	2011 U.S. Dollars
1960-01-01	11432
1961-01-01	11974
1962-01-01	12186
1963-01-01	12602
1964-01-01	13274
1965-01-01	13565
1966-01-01	14230
1967-01-01	14549
1968-01-01	15121
1969-01-01	16015
1970-01-01	17096
1971-01-01	17890
1972-01-01	18890
1973-01-01	19704
1974-01-01	20446
1975-01-01	20426
1976-01-01	21399
1977-01-01	22462
1978-01-01	22447
1979-01-01	23713
1980-01-01	24136
1981-01-01	24039
1982-01-01	24490
1983-01-01	25254
1984-01-01	25271
1985-01-01	25879
1986-01-01	26462
1987-01-01	26801
1988-01-01	27531
1989-01-01	28472
1990-01-01	29484
1991-01-01	30196
1992-01-01	30491
1993-01-01	30400
1994-01-01	31010
1995-01-01	31789
1996-01-01	32529
1997-01-01	33243
1998-01-01	34463
1999-01-01	35614
2000-01-01	36831
2001-01-01	37005
2002-01-01	37446
2003-01-01	37603
2004-01-01	38334
2005-01-01	38988
2006-01-01	40210
2007-01-01	41534
2008-01-01	41935
2009-01-01	40209
2010-01-01	41019
2011-01-01	42066