Year	current US$
1971	2143474165.74262
1972	1867529942.24124
1973	2159680104.26437
1974	2548803452.39239
1975	2414696403.26836
1976	2377983738.24104
1977	2729023613.88357
1978	3202928032.11397
1979	3508248840.52522
1980	3788845487.2465
1981	3677052338.69359
1982	3485739594.66962
1983	3507655583.17085
1984	3769059178.4297
1985	3825067193.0898
1986	4831520093.03942
1987	4236057303.43537
1988	4340735043.16395
1989	4405818028.07362
1990	4879299249.12748
1991	5521198870.12479
1992	5305106325.13253
1993	4792090932.51418
1994	4167887014.90554
1995	4941339500.71965
1996	5269589626.61257
1997	5302714338.42004
1998	5778140943.2257
1999	6272463494.6059
2000	3743322635.1443
2001	4086194304.65943
2002	4693884175.25109
2003	5607172374.45377
2004	6809152134.34498
2005	8463661516.40813
2006	17076970524.8496
2007	20535053279.006
2008	23787964192.9837
2009	21343494882.6188
2010	26184963835.497
2011	29976365277.5668
2012	30922113345.812
2013	50641289397.1637
2014	41988434252.1085
2015	38995841410.0269
2016	44848951918.4748
2017	47030490370.3145
2018	53349589399.23
2019	54482879880.0294
2020	59064018705.7674
2021	59884261177.4651