Year	current US$
1977	12810000.0079721
1979	0
1980	41870000.269264
1981	37050000.352785
1982	26289999.566972297
1983	25919999.5864183
1984	22489999.976009097
1985	31520000.251010098
1986	23029999.7311085
1987	24770000.224933
1988	29440000.0218302
1989	32940000.6011128
1990	21790000.0233203
1991	30950000.3047287
1992	28050000.0659376
1993	26769999.805837903
1994	37380000.086501196
1995	37119999.9582022
1996	30480000.078678098
1997	32889999.9298155
1998	30410000.035539303
1999	29150000.356137797
2000	21840000.083669998
2001	34250000.2942979
2002	58380000.2075732
2003	42850000.2715737
2004	33159999.7244775
2005	34620000.069961004
2006	35460000.3976375
2007	38209999.464452304
2008	47839999.9886751
2009	44610000.1856685
2010	46579999.6051937
2011	41559999.7900426
2012	49530970.0717917
2013	45677964.227972604
2014	43763352.4537086
2015	37311559.967696704
2016	28507052.8537035
2017	25407413.668930497
2018	30577370.0997233
2019	48966391.094029
2020	55199479.624629
2021	53958308.2795143
2022	58599649.99556541