Year	2011 U.S. Dollars
1960-01-01	4378
1961-01-01	4579
1962-01-01	4771
1963-01-01	5115
1964-01-01	4801
1965-01-01	5041
1966-01-01	5451
1967-01-01	5987
1968-01-01	6684
1969-01-01	7486
1970-01-01	8387
1971-01-01	9226
1972-01-01	10280
1973-01-01	11210
1974-01-01	11739
1975-01-01	12105
1976-01-01	12827
1977-01-01	13595
1978-01-01	14597
1979-01-01	15768
1980-01-01	17134
1981-01-01	18081
1982-01-01	18547
1983-01-01	19877
1984-01-01	21226
1985-01-01	21059
1986-01-01	21350
1987-01-01	23297
1988-01-01	25229
1989-01-01	27005
1990-01-01	28600
1991-01-01	29600
1992-01-01	30744
1993-01-01	33417
1994-01-01	35810
1995-01-01	37267
1996-01-01	38511
1997-01-01	40408
1998-01-01	38211
1999-01-01	40256
2000-01-01	43142
2001-01-01	41509
2002-01-01	42860
2003-01-01	45490
2004-01-01	49038
2005-01-01	51429
2006-01-01	54212
2007-01-01	56606
2008-01-01	54586
2009-01-01	52445
2010-01-01	59131
2011-01-01	60742