Year	2010 U.S. Dollars
1980-01-01	21184.9828376582
1981-01-01	19295.5852183700
1982-01-01	17290.8180745626
1983-01-01	17906.0163509295
1984-01-01	18304.5726983488
1985-01-01	16926.3747444092
1986-01-01	16571.4266715450
1987-01-01	17663.4657118083
1988-01-01	18240.5661888089
1989-01-01	17702.3755890439
1990-01-01	17934.7430502843
1991-01-01	19407.4436493518
1992-01-01	20178.4651617478
1993-01-01	22217.9133183868
1994-01-01	21623.0156816472
1995-01-01	21910.2398805927
1996-01-01	22220.6829070812
1997-01-01	22281.7951076819
1998-01-01	22634.8884697697
1999-01-01	22760.9869862741
2000-01-01	22955.0934939164
2001-01-01	22416.0818465599
2002-01-01	22038.3311989390
2003-01-01	22058.7633255054
2004-01-01	22144.4733857539
2005-01-01	22066.0711292424
2006-01-01	21796.0151385957
2007-01-01	21838.0745654035
2008-01-01	21563.6506660090
2009-01-01	20797.0052179038
2010-01-01	20722.1038895508
2011-01-01	20514.7563869279
2012-01-01	20921.1997104370
2013-01-01	21799.6521659427
2014-01-01	22390.6828514575
2015-01-01	22436.2075318381
2016-01-01	22291.4042492524
2017-01-01	22111.4772372579