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	23158020115.29543
1991	25395339828.992264
1992	22501459833.551216
1993	20021179855.385788
1994	21332740041.01755
1995	21209939855.813988
1996	20035119725.7489
1997	17236869997.024536
1998	18866709784.03093
1999	20861560053.11014
2000	18377540096.99822
2001	18434030235.767372
2002	19548849922.65702
2003	21452459879.01092
2004	23758269717.02278
2005	44350559799.43277
2006	30915360271.692295
2007	31289329495.90684
2008	36640910285.47288
2009	29235590190.887478
2010	26794650343.894966
2011	31202569923.400894
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	39505130353.92763