Year	current US$
1960	51810000
1961	53660000
1962	61810000
1963	63660000
1964	58470000
1965	73970000
1966	74770000
1967	60070000
1968	58280000
1969	62390000
1970	63300000
1971	59293735.4187001
1972	83204592.5925896
1973	166027275.478892
1974	263550066.125116
1975	276683891.746838
1976	294735309.230676
1977	213315990.487484
1978	152926055.91603
1979	172726932.856275
1980	80129191.6501661
1981	266705128.398288
1982	181840974.930274
1983	125873805.168585
1984	44340628.7092999
1985	147997715.289982
1986	250500000
1987	122688206.670544
1988	64226913.9158402
1989	46052566.5624097
1990	20156078.3030544
1991	54457347.4087743
1992	232397535.99076
1993	455795115.212642
1994	544234560.724552
1995	771509768.286737
1996	732155665.830735
1997	501074429.806571
1998	511080691.058341
1999	458508862.585456
2000	306319431.557217
2001	433230567.383338
2002	881748955.869228
2003	955608348.106304
2004	1496784362.17874
2005	1042595212.18723
2006	867438393.591878
2007	1289865496.28638
2008	870502510.19458
2009	1780874214.24059
2010	2241164555.88825
2011	2837310958.4935
2012	2301655547.62419
2013	2363513607.3673
2014	3525244981.05226
2015	3826807166.24954
2016	3021776307.17666
2017	3035198813.05231
2018	3977210469.90204
2019	2980519685.43951
2020	3046114358.80766