Year	current US$
1977	198541626
1978	253434753.4
1979	355955932.6
1980	523061462.4
1981	484047332.8
1982	427641510
1983	408608459.5
1984	332669097.9
1985	297614349.4
1986	149898284.9
1987	21663145.07
1988	37029144.29
1989	28785829.54
1990	8853591.7551556
1991	53510676.9892115
1992	34802542.9356883
1993	2310583.52763137
1994	3500636.47935988
1995	1463817.39249003
1996	547300.15504257
1997	1164844.85611633
1998	1328093.31967022
1999	9400236.738681
2000	1052141.64907635
2001	593358.431196269
2002	903977.979981037
2003	11562241.3614982
2004	20855603.8062873
2005	68030269.6896831
2006	101560829.630397
2007	54006296.4940061
2008	58148760.5802655
2009	47035790.5695872
2010	47474692.664549
2011	75506157.7661904
2012	38702386.7301581
2013	50482639.3650608
2014	54615715.5825
2015	1035451150
2016	744771120.37037
2017	275345845.078169
2018	67676279.7856165
2019	90600080.5251923
2020	92101664.9051897
2021	82545294.2181415
2022	82424279.4893329