Year	current US$
1970	185714245.688786
1971	127752212.389381
1972	376129960.61446
1973	468001265.147152
1974	575574144.486691
1975	461360653.753027
1976	1178125446.21167
1977	748969957.081544
1978	1208267348.22128
1979	1080052643.17181
1980	2028570257.61438
1981	8316886698.88341
1982	7084895368.77395
1983	4376321178.97585
1984	2964549854.50111
1985	2630133242.26736
1986	1684491919.80087
1987	1354799236.49622
1988	1097416600.15367
1989	742863110.954769
1990	670610518.481813
1991	396629144.068926
1992	381186339.900088
1993	215949884.623621
1994	267578388.349273
1995	355655909.557277
1996	415182203.28625
1997	443884241.49125
1998	440109466.202273
1999	492123795.380239
2000	538055760.119
2001	584547401.48291
2002	756311576.224184
2003	825281122.325508
2004	1070589615.87454
2005	1379877559.96549
2006	1987010692.84553
2007	2263542872.86616
2008	2755800669.26352
2009	2382463475.4447
2010	2951890147.13485
2011	3327346021.80004
2012	3754151375.1616
2013	4201897467.59523
2014	4717697864.73709
2015	4080469989.61475
2016	3365576495.33793
2017	3096152020.42726
2018	3419405226.23752
2019	3684317049.41595
2020	3539652396.23417
2021	3602999647.79807