Year	current US$
1970	713500001.1064113
1971	730710006.2146789
1972	875479998.3650439
1973	2169269978.2252326
1974	3869830047.7862353
1975	5702299892.991788
1976	5924509939.134121
1977	6996859862.86402
1978	6880979954.794056
1979	8042799885.794527
1980	9272629957.258694
1981	8876639943.331488
1982	7479719998.717316
1983	6480009941.339499
1984	6031929985.880857
1985	6729439941.287044
1986	6399709944.248199
1987	6784450071.096422
1988	5300050009.608268
1989	5128569936.990745
1990	12762750096.082685
1991	11533449827.19421
1992	8300329899.549491
1993	7335299915.075304
1994	7671250001.430517
1995	6020099861.860273
1996	6374499894.857409
1997	5885569985.747338
1998	6482210033.655169
1999	5512709961.891175
2000	5082809939.8613
2001	5475920011.281971
2002	5307289940.834047
2003	9084489860.534668
2004	11674739841.461178
2005	29295579914.093018
2006	17562190309.524544
2007	19061669792.175297
2008	22708910317.36136
2009	14318619856.864218
2010	12318010100.841526
2011	13655589836.120615
2012	15120080116.27197
2013	22498559654.235844
2014	22269969970.70314
2015	20726810295.105
2016	27757370086.669933
2017	30002789398.193382
2018	33943020240.783707
2019	30092379943.847675
2020	32811099685.668953
2021	40139670440.67384