Year	current US$
1974	11385350446.428572
1975	15096392737.857141
1976	17544004687.499996
1977	18738179600.000008
1978	20387160279.16666
1979	30205753548.387093
1980	19837966089.473682
1981	23142705407.20721
1982	20510868196.319023
1983	17803021848.888885
1984	17623104133.514988
1985	23412284045.977013
1986	29060653992.59259
1987	21075285254.37573
1988	25831999240.50633
1989	27935365966.069748
1990	32679230241.471844
1991	28020975071.90794
1992	29193806752.037254
1993	33402086481.565773
1994	23767040089.16208
1995	33202039698.985714
1996	39560519439.837845
1997	38910030059.5924
1998	71003284392.69112
1999	55945450562.70192
2000	58709937663.44276
2001	43417450281.82391
2002	53942161200.77547
2003	64975664824.42026
2004	91204519229.59558
2005	119694623541.67923
2006	137189819435.4312
2007	162919249907.3243
2008	189687467973.6493
2009	142517073201.88907
2010	169360525491.91568
2011	193149361293.28854
2012	205877722980.6665
2013	229026399296.55295
2014	233794236546.52277
2015	217931698414.60083
2016	217263388964.4006
2017	223825472725.08978
2018	218018222975.86972
2019	200839426592.38864
2020	195019320749.99234
2021	251062370514.4441
2022	272405372307.2163
2023	288318420082.9868