Year	current US$
1971	2105428184.76538
1972	2512925996.54652
1973	3323513737.82851
1974	4596118253.90739
1975	5114906202.75014
1976	5569810959.73676
1977	5739137404.25418
1978	6562334727.49978
1979	8109518879.78651
1980	9677653812.15304
1981	11354053313.1637
1982	12905056049.3912
1983	14710135019.3997
1984	16822629136.9589
1985	16347463592.6934
1986	15469371295.9457
1987	16831571118.3596
1988	21047868264.387
1989	25727287489.136
1990	30589761424.8446
1991	38255707795.724
1992	44567575017.1377
1993	50503174228.4959
1994	63880306924.3931
1995	77250074985.9991
1996	83369861077.2253
1997	89617062956.5492
1998	74506491078.8047
1999	74105054153.6544
2000	81689371443.1551
2001	74821348060.9398
2002	75334726282.0161
2003	78404138503.8477
2004	89158833073.9072
2005	100415541395.997
2006	122938231877.625
2007	151237701012.14
2008	157036480991.075
2009	152969410366.918
2010	204483987488.226
2011	231597329684.185
2012	240708642585.747
2013	246827310017.442
2014	258485853788.003
2015	239432352811.545
2016	249606217503.761
2017	264946106350.492
2018	270692169556.648
2019	263598529577.358
2020	232324806977.306
2021	276441220735.455