Year	current US$
1977	13300000.0622123
1979	0
1980	26769999.7611344
1981	18360000.081360303
1982	14890000.1421571
1983	15020000.0759214
1984	15809999.9316037
1985	17610000.1204759
1986	12379999.9263138
1987	13089999.7521192
1988	17209999.7662008
1989	20329999.9255687
1990	19110000.2191961
1991	17249999.9497086
1992	14830000.2086908
1993	15369999.881833801
1994	28519999.910146
1995	31280000.1185387
1996	25550000.0230968
1997	29120000.0625104
1998	24660000.005736902
1999	19060000.1793355
2000	14860000.1335144
2001	22319999.9593198
2002	47690000.006928995
2003	31980000.26308
2004	20850000.0089407
2005	20229999.7657537
2006	21379999.9803305
2007	21829999.7597933
2008	28819999.5905161
2009	34090000.0929832
2010	38680000.3051758
2011	32460000.1871586
2012	34591939.9698032
2013	34206263.4381
2014	33243211.9697332
2015	28257431.954145398
2016	21750074.6846199
2017	19369147.9191184
2018	19637899.9650478
2019	36117319.3156719
2020	37521409.660577804
2021	38968002.6471615
2022	30754429.936408993