Year	current US$
1970	21028191.21331179
1971	22750465.186129242
1972	26011544.42180584
1973	31750850.01206214
1974	43078184.38781857
1975	47999737.11089145
1976	48215940.06776629
1977	48404166.393618494
1978	49971309.14458628
1979	53175357.74939066
1980	56186256.88126229
1981	61862091.26062093
1982	63284012.165373385
1983	57971841.92435901
1984	56684261.976209745
1985	49725469.19830367
1986	47799408.772792675
1987	48013693.8948963
1988	54970254.354654394
1989	64312140.82460061
1990	66509139.43123308
1991	62871988.0700102
1992	61196416.211643465
1993	52111720.06745362
1994	47562020.06226219
1995	47837689.33768934
1996	44831790.59180576
1997	44670370.95007043
1998	35512175.26961948
1999	32706166.186238874
2000	32205614.519876905
2001	27107813.67392938
2002	25130650.89995814
2003	29563075.131042514
2004	36933205.292360224
2005	35680348.819726355
2006	34611710.09284217
2007	28470334.242703773
2008	42258230.867161945
2009	52199461.63882091
2010	57343262.81114028
2011	80826669.21695852
2012	121666862.59102748
2013	118560095.04160635
2014	121784282.45783633
2015	116562431.62045075
2016	133574227.96280012
2017	152796223.68582803
2018	175720088.05382445
2019	176940643.35160193
2020	187363708.82271907
2021	263682494.33340126
2022	251457982.47051683
2023	262402486.1935414