Year	2011 U.S. Dollars
1960-01-01	1537
1961-01-01	1579
1962-01-01	1567
1963-01-01	1663
1964-01-01	1777
1965-01-01	1832
1966-01-01	2004
1967-01-01	2073
1968-01-01	2255
1969-01-01	2510
1970-01-01	2671
1971-01-01	2892
1972-01-01	3024
1973-01-01	3410
1974-01-01	3666
1975-01-01	3870
1976-01-01	4321
1977-01-01	4757
1978-01-01	5168
1979-01-01	5517
1980-01-01	5329
1981-01-01	5635
1982-01-01	6008
1983-01-01	6642
1984-01-01	7207
1985-01-01	7670
1986-01-01	8523
1987-01-01	9475
1988-01-01	10476
1989-01-01	11074
1990-01-01	11985
1991-01-01	13019
1992-01-01	13627
1993-01-01	14344
1994-01-01	15446
1995-01-01	16656
1996-01-01	17684
1997-01-01	18529
1998-01-01	17345
1999-01-01	19070
2000-01-01	20575
2001-01-01	21235
2002-01-01	22627
2003-01-01	23146
2004-01-01	24124
2005-01-01	25027
2006-01-01	26196
2007-01-01	27406
2008-01-01	27834
2009-01-01	27791
2010-01-01	29411
2011-01-01	30254