Year	current US$
1975	655099376.236556
1976	844769599.392026
1977	1172504767.392166
1978	1308839854.569135
1979	1867088738.3989391
1980	2634135432.793207
1981	2449913681.91266
1982	2921041582.020279
1983	2895600572.586479
1984	2945329852.925458
1985	3315009896.904687
1986	3141833299.057406
1987	3412721268.4126844
1988	3648363030.0407557
1989	3529859279.340252
1990	2804596904.196497
1991	3074557200
1992	3273962449.46957
1993	3322967970.2993593
1994	3611004353.870818
1995	3825795676.41474
1996	4187254987.106862
1997	4054737840.0184097
1998	4246681045.8372498
1999	3867422069.01988
2000	4114730187.4834156
2001	4519996304.528575
2002	4880982026.558569
2003	5534014235.43902
2004	6201560909.399389
2005	7443493150.684931
2006	8805338893.63267
2007	10494206609.31065
2008	14799033484.933582
2009	12886019756.344437
2010	14322694520.73781
2011	17584924534.84776
2012	20014367807.383232
2013	19873230488.97886
2014	22337078073.77735
2015	22081665620.22212
2016	25533631162.816414
2017	27180445936.445038
2018	35388468944.24184
2019	28649919426.21846
2020	17172040292.657782
2021	19944331433.413887
2022	26129838052.56239
2023	27856369029.39569