Year	2010 U.S. Dollars
1968-01-01	1454.58600359962
1969-01-01	1450.87426704582
1970-01-01	1465.97049762468
1971-01-01	1493.86185294435
1972-01-01	1499.37887016383
1973-01-01	1515.40623586470
1974-01-01	1703.41530331559
1975-01-01	1855.13143947432
1976-01-01	2104.66084927433
1977-01-01	2077.05308071372
1978-01-01	2356.04931029749
1979-01-01	2762.09850387006
1980-01-01	3345.99053618180
1981-01-01	3228.63052628661
1982-01-01	3248.88698553113
1983-01-01	2750.33914717800
1984-01-01	2641.82852903446
1985-01-01	2616.41807187294
1986-01-01	2676.17054575181
1987-01-01	2861.66912456952
1988-01-01	2798.98403403134
1989-01-01	2649.89125455205
1990-01-01	4079.34447649740
1991-01-01	1427.92118867180
1992-01-01	1840.43870354158
1993-01-01	2328.06452333503
1994-01-01	2345.58666185933
1995-01-01	2322.87382598427
1996-01-01	2500.00610721899
1997-01-01	2937.47385965329
1998-01-01	3839.82745787427
1999-01-01	4379.19934358719
2000-01-01	4311.28131409038
2001-01-01	4285.86362018418
2002-01-01	3880.11160294019
2003-01-01	2526.04314247089
2004-01-01	3792.14246289002
2005-01-01	3857.61040500793
2006-01-01	4143.69170316415
2007-01-01	4098.30662664446
2008-01-01	4325.66798265067
2009-01-01	4354.68362662857
2010-01-01	4502.74904825726
2011-01-01	4695.35721556290
2012-01-01	5178.42229352013
2013-01-01	5390.00958575076
2014-01-01	5253.62707506240
2015-01-01	5336.64828740669
2016-01-01	5750.61136059944
2017-01-01	5545.93729055897