Year	current US$
1977	7009999.92713332
1979	0
1980	29410000.3093481
1981	30450000.314042002
1982	21739999.6817112
1983	20849999.522790298
1984	15600000.0089407
1985	29610000.433400303
1986	21569999.840110503
1987	21470000.3489852
1988	25000000.154599503
1989	32470000.447705403
1990	20960000.056773398
1991	28750000.2179295
1992	28549999.8610467
1993	27369999.9842793
1994	33269999.474286996
1995	31510000.4468113
1996	26900000.0339001
1997	30750000.0111759
1998	32289999.5800108
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