Year	2011 U.S. Dollars
1975-01-01	36952
1976-01-01	37420
1977-01-01	38204
1978-01-01	39690
1979-01-01	41606
1980-01-01	42608
1981-01-01	42620
1982-01-01	43431
1983-01-01	44578
1984-01-01	45684
1985-01-01	47118
1986-01-01	48517
1987-01-01	49929
1988-01-01	52011
1989-01-01	54139
1990-01-01	54680
1991-01-01	54469
1992-01-01	56558
1993-01-01	59664
1994-01-01	62718
1995-01-01	64075
1996-01-01	65435
1997-01-01	67201
1998-01-01	69300
1999-01-01	70262
2000-01-01	72512
2001-01-01	73185
2002-01-01	73829
2003-01-01	75270
2004-01-01	78065
2005-01-01	79255
2006-01-01	81255
2007-01-01	83769
2008-01-01	81903
2009-01-01	76909
2010-01-01	79526
2011-01-01	80779