Year	current US$
1970	9879999.77171424
1971	10029999.732971169
1972	11100000.016391277
1973	790000.0214576758
1974	1969999.909400952
1975	11750000.298023228
1976	3670000.0166893066
1977	10380000.084638586
1978	4550000.01192093
1979	4869999.974966049
1980	29680000.782012932
1981	53999998.21186064
1982	87259998.60465522
1983	10480000.004172333
1984	-2210000.0679492927
1985	10110000.118613238
1986	2759999.9308586107
1987	109999.8652935042
1988	-4780000.012367958
1989	2479999.698698532
1990	122749997.6381662
1991	61240000.51431361
1992	51310000.03777439
1993	62420000.2048165
1994	76940000.42416155
1995	55489999.44701787
1996	60759999.52293929
1997	59370000.26181341
1998	58340000.716969416
1999	40159999.93681908
2000	37469999.335706234
2001	16109999.87274409
2002	17090000.2643466
2003	21669999.394565806
2004	-16299999.695271261
2005	-2530000.3290176513
2006	-379999.96542931
2007	-6240000.367164605
2008	14950000.10728836
2009	24770000.278949786
2010	17229999.959468838
2011	16490000.605583195
2012	61690000.41484838
2013	31979999.22931198
2014	32399999.97615812
2015	99739999.89032745
2016	188099995.73230708
2017	229330002.12907827
2018	166249995.5892563
2019	167470001.22070312
2020	206830006.2417985
2021	139300000.0715255
2022	108610001.7130374