Year	current US$
1971	0
1972	0
1973	0
1974	0
1975	0
1976	0
1977	127028.525303371
1978	22526069.9407951
1979	230912180.076411
1980	401607480.046765
1981	351114277.995729
1982	154608789.99961
1983	332378158.078007
1984	477888359.13758
1985	744282012.447497
1986	242750533.810231
1987	514802788.454363
1988	394421984.700453
1989	755381126.285023
1990	957123848.301338
1991	489801881.518713
1992	502841736.127272
1993	432063980.223065
1994	297047218.447999
1995	345818298.498244
1996	393667428.88107
1997	427783394.050972
1998	198953015.472005
1999	262609875.036139
2000	478210105.514683
2001	307543797.669599
2002	288653055.703572
2003	278485343.693321
2004	389603598.231754
2005	818985352.714342
2006	1038802219.13982
2007	1149706922.58906
2008	1769224482.75202
2009	791848510.649782
2010	989876066.062548
2011	1387150706.07178
2012	1373003002.76677
2013	1222020929.88659
2014	1190731465.56829
2015	562925956.073147
2016	481177750.754275
2017	708503155.252443
2018	1017462207.95838
2019	921729687.129131
2020	515646754.941623
2021	1031441104.29709