Year	current US$
1970	3391589959.831909
1971	3676090016.126631
1972	3507470035.780221
1973	4479899988.580496
1974	6016800048.232077
1975	7966449831.614278
1976	7814619871.765375
1977	7582269951.889296
1978	8984129913.866524
1979	9516369969.386614
1980	11991979938.296593
1981	12138589875.070389
1982	10905130043.10802
1983	10452889986.790728
1984	10422389927.653603
1985	11123500022.459784
1986	12312179867.781702
1987	13676910097.65491
1988	14455270024.001598
1989	15025659990.845251
1990	25278340142.646812
1991	29658069839.978596
1992	27117929837.63295
1993	24336729806.939133
1994	25764520074.129128
1995	27934679769.754425
1996	23524569745.585327
1997	19767359972.000122
1998	22038929789.066334
1999	25243860010.38553
2000	22655610111.95184
2001	22037190330.02854
2002	22977399928.092964
2003	25281969843.000183
2004	28566129820.629967
2005	44350559799.43277
2006	30915360271.692295
2007	31289329495.90684
2008	36640910285.47288
2009	29235590190.887478
2010	26794650343.894966
2011	31202849923.40209
2012	29660120085.47784
2013	33670220029.711727
2014	35140350226.6407
2015	30650490095.25779
2016	32304060224.23507
2017	31523079824.32843
2018	28479630035.87726
2019	24710170134.782803
2020	34609030038.3568
2021	39507310353.92361