Year	current US$
1970	28332394.5257262
1971	37589690.4810324
1972	58498997.8227592
1973	88368407.2138246
1974	100093146.329907
1975	131888680.265421
1976	136390009.981279
1977	142384206.224813
1978	171939655.344924
1979	177949674.273602
1980	224595894.534247
1981	238258675.923639
1982	304176725.865404
1983	357859239.446067
1984	450240805.719434
1985	422481297.562555
1986	488835554.043337
1987	626326823.039843
1988	575001689.080096
1989	596321934.478218
1990	688967272.493093
1991	685091732.853408
1992	726826113.224357
1993	663586520.155872
1994	435170743.456755
1995	536823214.187171
1996	633996734.485901
1997	567474376.769128
1998	486168480.568248
1999	579055142.442084
2000	778326752.0878
2001	695827420.005618
2002	761424777.937929
2003	888695261.062245
2004	1160959018.11458
2005	1586300144.25437
2006	1936821434.05367
2007	2116109909.13108
2008	2819583614.55254
2009	2461661620.96262
2010	3264058998.61179
2011	3882853039.16022
2012	4388628546.7757
2013	4555318668.78751
2014	4564086659.73173
2015	3179764088.64731
2016	2650226988.60009
2017	2803591628.53989
2018	3247024755.2044
2019	3048034769.21882
2020	2645120483.62643
2021	3289147878.8591