Year	current US$
1971	298323778.865229
1972	368688951.861488
1973	445675496.664751
1974	492662117.629366
1975	589024868.70557
1976	607293226.139805
1977	620920693.884404
1978	782658497.258757
1979	1033979890.05788
1980	1219033252.12501
1981	1128481017.76637
1982	1047099984.30035
1983	909597281.514591
1984	857051787.361502
1985	886368909.670555
1986	1122180337.12104
1987	1316968437.20876
1988	1367452743.79584
1989	1222711093.48133
1990	1604908484.51338
1991	1630386090.63926
1992	1302119180.67563
1993	1828353230.2545
1994	1177584354.56876
1995	1583574194.10182
1996	1716003877.11819
1997	1678008642.49584
1998	1842780853.10202
1999	2947995159.72356
2000	2850435372.75477
2001	3043798671.56497
2002	3557102964.57223
2003	4577784294.67138
2004	5323680152.2122
2005	5694364252.82562
2006	6096392203.57702
2007	7095413893.15639
2008	8512864254.60321
2009	8396600142.56359
2010	8188774224.96022
2011	9279577440.04503
2012	9757972934.37877
2013	11126080999.201
2014	11865082942.314
2015	10210946433.7156
2016	10603315191.5751
2017	11291335985.2186
2018	12668487223.1005
2019	12759759263.4295
2020	13830132732.4729
2021	15737769728.0295