Year	Current U.S. Dollars
1991-01-01	3473540601.82161
1992-01-01	2257121668.19352
1993-01-01	1878248741.04949
1994-01-01	2167564194.73420
1995-01-01	2813313278.81082
1996-01-01	2907514522.92503
1997-01-01	3338938830.01743
1998-01-01	3723909226.86781
1999-01-01	4153736347.44223
2000-01-01	3953846310.66081
2001-01-01	3596443004.56165
2002-01-01	3472191962.42287
2003-01-01	2960306120.93557
2004-01-01	3537720277.49988
2005-01-01	4310358095.62898
2006-01-01	4756204069.61876
2007-01-01	5885325589.97642
2008-01-01	6548530572.35291
2009-01-01	6584649419.28348
2010-01-01	6622541528.56888
2011-01-01	7516834160.25277
2012-01-01	7890216507.68913
2013-01-01	8452509315.87722
2014-01-01	8776350789.59930
2015-01-01	8724656126.49849
2016-01-01	7970649131.23416
2017-01-01	8408150517.97684