Year	current US$
1977	839720214.8
1978	931934021
1979	831613464.4
1980	1052184448
1981	1530813477
1982	1574718018
1983	2031730835
1984	1240318481
1985	858967834.5
1986	489860687.3
1987	466285003.7
1988	496909698.5
1989	471626220.7
1990	445657364.329723
1991	408936302.201816
1992	394241440.862309
1993	323947593.784757
1994	282746809.680841
1995	221932618.065439
1996	271520289.988285
1997	192029739.358015
1998	207881338.679897
1999	213017908.786864
2000	463000000
2001	683000000
2002	786000000
2003	676000000
2004	975000000
2005	914000000
2006	945000000
2007	762200000
2008	964200000
2009	1361000000
2010	1609000000
2011	650000000
2012	1971000000
2013	3199300000
2014	1119700000
2015	839800000
2016	755800000
2017	680200000
2018	744200000
2019	1082300000
2020	923600000
2021	900400000