Year	current US$
1974	441451192.18450737
1975	490250956.62163657
1976	430651369.78334385
1977	451428155.0126383
1978	323102370.84826124
1979	376759380.3648003
1980	157163880.3860885
1981	305227493.0246905
1982	320372689.4797069
1983	186066321.83865204
1984	172825373.32764623
1985	194003065.4686881
1986	141864286.96524104
1987	385557288.75186193
1988	169857030.78422257
1989	172323797.24383828
1990	190071642.70899647
1991	218884362.48923013
1992	291229669.57598746
1993	109949531.91919838
1994	292808450.7194511
1995	537186133.1267735
1996	523487692.4631711
1997	650179987.4071578
1998	724609673.1788591
1999	760829835.62171
2000	678130627.3518153
2001	954731874.0964711
2002	913086490.4014949
2003	1273985559.8329735
2004	1366880847.341183
2005	1686414789.3358312
2006	1567565359.9261672
2007	2120728306.8697436
2008	2512547242.945179
2009	2419237702.3631425
2010	2624968438.203426
2011	2562165204.2703247
2012	2798458769.894728
2013	3081567080.673711
2014	3751669388.371024
2015	3580279461.976883
2016	4027971621.374566
2017	4733338411.050441
2018	5330634006.455722
2019	5622319820.9671
2020	6252644730.685626
2021	7156118946.722274