Year	current US$
1977	64610000.61035161
1979	148960006.71386698
1980	145120010.37597698
1981	126350006.103516
1982	111059997.558594
1983	120209999.084473
1984	117299995.422363
1985	125380004.88281299
1986	99720001.2207031
1987	105139999.38964799
1988	127639999.38964799
1989	154940002.44140598
1990	176970001.220703
1991	169000000
1992	125879997.253418
1993	132720001.220703
1994	199270004.272461
1995	227500000
1996	213309997.55859402
1997	215439987.18261698
1998	213539993.28613302
1999	185330001.831055
2000	132550003.051758
2001	311369995.11718804
2002	309929992.675781
2003	270709991.455078
2004	194860000.61035198
2005	199059997.55859402
2006	209790008.544922
2007	212949996.94824198
2008	269899993.89648396
2009	343100006.10351604
2010	310440002.441406
2011	310869995.11718804
2012	329321075.439453
2013	350632019.042969
2014	336666473.388672
2015	311245330.810547
2016	256361267.089844
2017	213596160.888672
2018	210536300.65918
2019	401313354.49218804
2020	420685424.80468804
2021	327505828.857422
2022	313213431.6265583