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	6339909894.466402
1997	5880489985.823632
1998	6469100033.760073
1999	5494709961.891175
2000	5060029939.651492
2001	5458000011.444096
2002	5285759941.101076
2003	9061279860.496521
2004	11649559841.156002
2005	29295579914.093018
2006	17562190309.524544
2007	19061669792.175297
2008	22708200317.382816
2009	14318329856.872562
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