Year	current US$
1977	5609999.9230355
1979	0
1980	28350000.3181398
1981	29890000.3191084
1982	20919999.677687902
1983	20229999.5329231
1984	14929999.999702
1985	28860000.4389882
1986	21049999.8517334
1987	20970000.3415346
1988	24470000.1645833
1989	32090000.4468858
1990	20430000.0667572
1991	28030000.2340227
1992	28419999.8583645
1993	27219999.9820441
1994	32799999.475479096
1995	31510000.4468113
1996	26890000.0341237
1997	30750000.0111759
1998	32129999.574273802
1999	31310000.173747502
2000	21999999.8100102
2001	30500000.6575137
2002	32619999.831542403
2003	31250000.1657754
2004	32889999.53866
2005	35090000.0035763
2006	33700000.1370907
2007	35920000.0166893
2008	41299999.9821186
2009	37440000.6532669
2010	41049999.475479096
2011	38800000.1907349
2012	39657014.9906911
2013	49410779.113648504
2014	41025889.486074395
2015	34669983.1187725
2016	25012137.144804
2017	18326535.9997749
2018	20696989.893913303
2019	29664146.2445259
2020	31017159.9984169
2021	30580590.724945102
2022	34105430.603027344