Year	2011 U.S. Dollars
1964-01-01	10726
1965-01-01	11275
1966-01-01	11964
1967-01-01	12334
1968-01-01	13016
1969-01-01	14010
1970-01-01	14429
1971-01-01	14901
1972-01-01	15923
1973-01-01	16974
1974-01-01	17768
1975-01-01	17703
1976-01-01	18076
1977-01-01	18333
1978-01-01	18358
1979-01-01	18231
1980-01-01	18370
1981-01-01	18241
1982-01-01	18370
1983-01-01	18607
1984-01-01	18862
1985-01-01	19229
1986-01-01	19794
1987-01-01	20841
1988-01-01	21854
1989-01-01	22865
1990-01-01	23694
1991-01-01	24241
1992-01-01	24386
1993-01-01	24060
1994-01-01	24567
1995-01-01	25185
1996-01-01	25735
1997-01-01	26660
1998-01-01	27754
1999-01-01	28922
2000-01-01	30128
2001-01-01	30883
2002-01-01	31264
2003-01-01	31700
2004-01-01	32207
2005-01-01	32818
2006-01-01	33636
2007-01-01	34182
2008-01-01	33941
2009-01-01	32432
2010-01-01	32309
2011-01-01	32501