Year	current US$
1970	43726301.3393474
1971	80098452.995639
1972	96341102.5422753
1973	165580109.682805
1974	915508025.599636
1975	844646208.125705
1976	917208588.396453
1977	840427942.281665
1978	987447386.906412
1979	2739693225.43666
1980	3592483220.4832
1981	3108044659.83659
1982	1863654824.78627
1983	2473092559.19119
1984	2401582329.00079
1985	2199318417.41049
1986	931449367.193835
1987	1400647106.77749
1988	1128806889.42022
1989	1787538011.158
1990	2768279257.76968
1991	1553941580.99584
1992	1869722611.88433
1993	1946267961.32689
1994	2070253831.2186
1995	2593952668.10345
1996	3444839433.88674
1997	3374717476.61785
1998	1883122513.59253
1999	3109432479.33097
2000	5427005136.06793
2001	4153175272.4088
2002	4256459591.72433
2003	4525016915.64417
2004	5524514419.72759
2005	8344973146.6414
2006	9969808009.79095
2007	10304146208.4505
2008	13752915342.0948
2009	7510584827.11579
2010	9174297089.49123
2011	14319072094.6536
2012	14117555621.3366
2013	12890482899.9008
2014	11398619758.716
2015	4610440280.65763
2016	3098045673.46308
2017	4240723825.02509
2018	7274093480.8145
2019	6609773587.29088
2020	3025506762.95828
2021	7613365455.12557