Year	current US$
1970	13153086.3004922
1971	17405410.9854326
1972	41723453.4088337
1973	139872033.639556
1974	933149046.404888
1975	1251150325.24958
1976	1422119015.67309
1977	1681151494.16797
1978	1618887085.33803
1979	3556804525.79092
1980	3710352324.69903
1981	2880375392.05389
1982	1958930840.35944
1983	2217387631.60426
1984	2672593508.52223
1985	3145027064.95229
1986	1666441879.87487
1987	2114939641.59628
1988	1600333031.49592
1989	2064590917.08802
1990	3344587447.39304
1991	2089966382.95565
1992	1973279857.44061
1993	1977669828.1585
1994	1624372858.6629
1995	2010816474.68803
1996	2220964608.81515
1997	2007899416.473
1998	1180938437.12544
1999	1331081399.36459
2000	3396215297.77427
2001	2925564380.56586
2002	3252832959.24459
2003	3773623506.58448
2004	5135661529.00103
2005	6528465194.15411
2006	6945644401.40742
2007	7784010592.75807
2008	12247496577.3194
2009	6922575172.30357
2010	10836240612.0228
2011	15508259352.8757
2012	11572004499.5734
2013	9644762331.30093
2014	10797173552.1633
2015	7509900398.61814
2016	6967689760.04788
2017	9812513365.62589
2018	15779711025.6374
2019	17727560179.3865
2020	14478792889.8561
2021	25049305200.9794