Year	current US$
1967	33415906.523834378
1968	23759980.992015205
1969	22319982.144014284
1970	35279971.776022576
1971	85659287.77670836
1972	109439694.81959388
1973	126612599.66464771
1974	504053271.56919515
1975	746960046.3231037
1976	929936016.2130864
1977	899826577.880718
1978	813549218.297626
1979	920671974.5222931
1980	1344238563.983787
1981	1649970469.0214245
1982	2053271279.6757383
1990	1442912873.8621585
1991	1703511053.3159947
1992	2036410923.276983
1993	2190637191.157347
1994	2033810143.0429127
1995	2067620286.0858257
1996	2092327698.3094928
1997	2794538361.5084524
1998	4344221586.475943
1999	3480536801.040312
2000	3014030429.1287384
2001	3318194278.283485
2002	3755527958.387516
2003	4741433550.06502
2004	6034792457.737321
2005	6842974512.353706
2006	8883176072.821846
2007	12063976853.055916
2008	18648474902.47074
2009	16116307412.223667
2010	14081592977.893368
2011	22127698309.492847
2012	24171131339.40182
2013	26930559167.750324
2014	27649674902.47074
2015	26770611183.355007
2016	29524837451.23537
2017	26942782834.850456
2018	27901430429.12874
2019	25496614304.291286
2020	23968043953.185955
2021	22594206241.872562