Year	current US$
1970	41666459.5854546
1971	42689716.6018751
1972	60154979.1231241
1973	129664324.68109
1974	125605776.063733
1975	138582008.360959
1976	146141986.784703
1977	197943372.954476
1978	188249972.621695
1979	285273577.294987
1980	336089664.510273
1981	213988501.681839
1982	256215792.884404
1983	237463189.388242
1984	151492390.718118
1985	157863664.507635
1986	224840040.169253
1987	245858953.774807
1988	235982047.088115
1989	253540629.217252
1990	381810474.377715
1991	435210224.346564
1992	551217659.780774
1993	462926837.525599
1994	543957720.165914
1995	812027417.749814
1996	851707297.833716
1997	728239722.799307
1998	583295844.398223
1999	406411401.41242
2000	414615606.008779
2001	494022109.25584
2002	536600434.674866
2003	820171874.771839
2004	795581623.479598
2005	631089196.585547
2006	775501607.290762
2007	1125025334.31823
2008	1745868941.91056
2009	1609365594.99327
2010	1615156165.99288
2011	2144665199.01065
2012	1897939890.74257
2013	1849767844.56644
2014	2559391893.01969
2015	1850941071.0839
2016	2070550062.22138
2017	2434509181.69175
2018	1377698635.55887
2019	1258749414.04963
2020	1527004995.27872
2021	1413973995.69765