Year	current US$
1972	8350898.2035928145
1973	16679982.879155373
1974	59432058.20229993
1975	37236653.83291158
1976	23186326.507667266
1977	21620602.666814514
1978	24822041.55168092
1979	26117738.847202398
1980	18450497.811542124
1981	12610931.781226479
1982	10899533.708030425
1983	10595744.201654933
1984	16830600.455104303
1985	9418388.91818185
1986	10199072.310080256
1987	9977916.64916187
1988	9786812.020863999
1989	9762238.088497758
1990	8183786.513792908
1991	10284765.173444176
1992	9967458.550227372
1993	9513647.862038951
1994	10573407.001713032
1995	11522863.414015818
1996	9190151.839438187
1997	13343434.66579584
1998	11238346.730928216
1999	12841349.720958741
2000	8129381.671321239
2001	10116682.579565356
2002	14254731.296891224
2003	15697431.244544119
2004	12637936.182480333
2005	16107542.499921722
2006	11455581.551733356
2007	21283999.62512719
2008	20348152.708739802
2009	19531085.51079443
2010	19091556.369300257
2011	25787091.410399366
2012	26415597.001866844
2013	22248416.024436135
2014	24098182.470480807
2015	26692059.89076621
2016	34308904.754187815
2017	29429130.15287126
2018	19125672.81225811
2019	32503688.198945157
2020	21159214.361169513
2021	10745871.468663426
2022	19640321.87805203
2023	20644623.83843645