Year	Current U.S. Dollars
1968-01-01	777.315748219320
1969-01-01	801.084937150190
1970-01-01	921.345944098883
1971-01-01	1177.652911574310
1972-01-01	1511.466642792700
1973-01-01	2226.270426636560
1974-01-01	6433.037131615940
1975-01-01	6296.303433532710
1976-01-01	8186.319711997460
1977-01-01	9012.611634223900
1978-01-01	9247.361643146100
1979-01-01	12185.653009808900
1980-01-01	16892.363401751500
1981-01-01	17777.353383974800
1982-01-01	13870.194419323100
1983-01-01	10980.399958886100
1984-01-01	9581.511758563520
1985-01-01	7877.544967471280
1986-01-01	6270.231993838160
1987-01-01	5899.619098078680
1988-01-01	5823.475825222440
1989-01-01	6051.332708407610
1990-01-01	7204.728650530020
1991-01-01	7838.784024388780
1992-01-01	7888.209562875500
1993-01-01	7445.115492390450
1994-01-01	7382.132166280190
1995-01-01	7650.739368560450
1996-01-01	8293.220702703840
1997-01-01	8508.518662042060
1998-01-01	7382.160600062630
1999-01-01	7968.548574419970
2000-01-01	9126.954276805960
2001-01-01	8643.494004829480
2002-01-01	8655.311531272180
2003-01-01	9567.458285314860
2004-01-01	11138.807464899700
2005-01-01	13739.829446377500
2006-01-01	15334.669939608500
2007-01-01	16472.166046674900
2008-01-01	20037.832338824200
2009-01-01	16094.293097575600
2010-01-01	19259.587256846500
2011-01-01	23770.747386207200
2012-01-01	25303.094621303000
2013-01-01	24934.386142316600
2014-01-01	24575.403037832700
2015-01-01	20732.861721856500
2016-01-01	19982.085631405900
2017-01-01	20760.906011766200