Year	current US$
1970	20224684.1748584
1971	53600707.6212843
1972	57917298.9844738
1973	69281167.0991608
1974	286001646.772402
1975	468878648.624174
1976	548754123.824865
1977	682274225.984547
1978	743598630.963138
1979	1636698729.79407
1980	1244491923.67073
1981	2395176984.8876
1982	2366570751.5372
1983	3023101970.41646
1984	2944655974.71956
1985	3900682518.58246
1986	1915697007.1904
1987	2385458377.79306
1988	2049257676.72936
1989	3353739781.61001
1990	4275843771.64096
1991	2643773979.81388
1992	2237284760.8204
1993	1927527282.56396
1994	2171024180.15179
1995	2895225063.72507
1996	3308413558.07737
1997	3105380094.74039
1998	1940836640.80953
1999	2937033428.25118
2000	4742916067.83673
2001	3985143000.71544
2002	4436500606.98078
2003	4943726536.83843
2004	7796251637.38817
2005	9716845640.42332
2006	11398563177.3427
2007	12999901859.7379
2008	19799862368.4039
2009	10343117598.6643
2010	16344763336.7285
2011	26220240884.8097
2012	23665514941.8257
2013	20779056423.3103
2014	18082919033.9469
2015	9287508871.55921
2016	7902369283.89902
2017	11671795066.1649
2018	15651453703.2984
2019	11522389872.3015
2020	7001776620.05137
2021	16005565905.1323