Year	current US$
1977	17645269.39
1978	12892250.06
1979	19397583.01
1980	16891616.82
1981	28294628.14
1982	32895336.15
1983	19556180.95
1984	3806286.573
1985	619640.8272
1986	785054.6241
1987	1143025.756
1988	1382946.491
1989	712248.8618
1990	848635.8523
1991	349842.1311
1992	587726.891
1993	1125808.835
1994	43685417.18
2005	0
2006	0
2007	0
2008	0
2009	1205656948.574
2010	1413248656.7315
2011	1919476002.19345
2012	2113579667.55738
2013	1890271472.97894
2014	1903970851.55067
2015	2046579806.18273
2016	1856034930.78343
2017	1729883817.47582
2018	1427703019.441
2019	1417011952.8873
2020	1832039380.8915
2021	2573626885.68752
2022	3085043420.98222
2023	3115893855.19204