Year Current U.S. Dollars 1977-01-01 792.762368951050 1978-01-01 991.572871356869 1979-01-01 1154.416610631040 1980-01-01 1246.002409352780 1981-01-01 1276.905952456900 1982-01-01 1347.451338932790 1983-01-01 1373.168261244520 1984-01-01 1478.410958017620 1985-01-01 1678.862575265190 1986-01-01 1873.216485610760 1987-01-01 2163.509313298000 1988-01-01 2410.286538297390 1989-01-01 2759.681937767810 1990-01-01 2888.347660311560 1991-01-01 3118.148432298180 1992-01-01 3191.016733311840 1993-01-01 3151.540462694520 1994-01-01 3270.578087770380 1995-01-01 3413.021979138380 1996-01-01 3640.138938494030 1997-01-01 3878.390385797280 1998-01-01 4401.421320836180 1999-01-01 4751.575978099510 2000-01-01 5117.589922852720 2001-01-01 5109.958715207660 2002-01-01 5292.232379294080 2003-01-01 5773.073576629130 2004-01-01 5836.177063129210 2005-01-01 6754.512392507900 2006-01-01 6766.486859902450 2007-01-01 7324.190456167750 2008-01-01 7947.444326843920 2009-01-01 7395.088125250350 2010-01-01 7365.666659236400 2011-01-01 7410.408438417000 2012-01-01 7583.187001906960 2013-01-01 7956.076547895940 2014-01-01 8569.776997757440 2015-01-01 9333.270231372700 2016-01-01 9841.764050361010 2017-01-01 10376.227029050800