Year	current US$
1970	196516624.7954
1971	184643973.863797
1972	224506402.078046
1973	252500730.779154
1974	351828989.42071
1975	393715477.213937
1976	472367114.270378
1977	612011468.125941
1978	688200109.077204
1979	866157721.336938
1980	1122206885.21902
1981	1413532750.75508
1982	1430617639.28496
1983	1340405398.13357
1984	1254949582.53957
1985	1196915949.64191
1986	1151621131.00088
1987	1102139281.4387
1988	1105138567.85658
1989	1206473251.44656
1990	1276946588.66954
1991	1422257871.45102
1992	1505288761.39364
1993	1863306104.94943
1994	2278390264.06579
1995	2550656357.31678
1996	2733168563.6049
1997	2906083165.64312
1998	2927315536.31905
1999	2342091156.78102
2000	2098996307.33873
2001	2763180321.76853
2002	3170809020.70606
2003	3808181064.22117
2004	4247060658.51999
2005	4682462306.64491
2006	5454392403.91521
2007	6181242000
2008	7231375000
2009	7760766000
2010	9282099000
2011	9624660000
2012	10834312000
2013	11566160000
2014	13186386698.7024
2015	14902297603.9443
2016	16157350555.5604
2017	16876254623.2221
2018	18498171014.7247
2019	19409291934.6039
2020	18417518033.234
2021	20324821758.5965