Year	current US$
1970	0
1971	0
1972	0
1973	1781901.61978399
1974	36569763.3361952
1975	53218048.2810682
1976	16494401.8745395
1977	46887635.7020405
1978	2410724.59477256
1979	4053860.11527023
1980	4750191.21946765
1981	7929355.77569329
1982	5268657.51309837
1983	3663278.81114994
1984	3942728.88348351
1985	3065124.8954374
1986	979802.906382875
1987	909303.101384489
1988	3315673.57900564
1989	5850915.48120122
1990	4825345.07112623
1991	2068214.39405234
1992	3017834.62610287
1993	808823.66310565
1994	1266712.4765478
1995	1380846.73544797
1996	1217582.73558483
1997	4354461.01580886
1998	2952493.64983483
1999	3009368.85607522
2000	4639147.34912267
2001	4868835.82267142
2002	8017252.67217982
2003	7531447.49320025
2004	10438711.1039129
2005	23666579.7005297
2006	111861898.95742
2007	184747146.013928
2008	492277818.24227
2009	379666026.965845
2010	280048709.40328
2011	473264593.7433
2012	410811051.434157
2013	321241005.923772
2014	218614362.989292
2015	165246245.842962
2016	165795286.549078
2017	209299701.060563
2018	166752747.108267
2019	30952822.5223727
2020	29359833.097081
2021	140743010.208368