Year	2011 U.S. Dollars
1960-01-01	11879
1961-01-01	12107
1962-01-01	12172
1963-01-01	12662
1964-01-01	13316
1965-01-01	13571
1966-01-01	13803
1967-01-01	14110
1968-01-01	14687
1969-01-01	14972
1970-01-01	15308
1971-01-01	15582
1972-01-01	16135
1973-01-01	17298
1974-01-01	17100
1975-01-01	17016
1976-01-01	17456
1977-01-01	17886
1978-01-01	18477
1979-01-01	18981
1980-01-01	18571
1981-01-01	18328
1982-01-01	18762
1983-01-01	19472
1984-01-01	20013
1985-01-01	20733
1986-01-01	21576
1987-01-01	22640
1988-01-01	23854
1989-01-01	24405
1990-01-01	24779
1991-01-01	24253
1992-01-01	24399
1993-01-01	25097
1994-01-01	26178
1995-01-01	26935
1996-01-01	27707
1997-01-01	28703
1998-01-01	29630
1999-01-01	30459
2000-01-01	31640
2001-01-01	32428
2002-01-01	33102
2003-01-01	34230
2004-01-01	35055
2005-01-01	35792
2006-01-01	36511
2007-01-01	37588
2008-01-01	36975
2009-01-01	35279
2010-01-01	35689
2011-01-01	35688