Year	current US$
1970	5465032496.07536
1971	6270888005.47602
1972	7666645757.49656
1973	11781792231.3409
1974	15449560572.0534
1975	11029533476.4812
1976	15093861671.6782
1977	12710593579.069
1978	12225721844.4106
1979	17475453729.0167
1980	18623251312.503
1981	21134534892.788
1982	10301566128.1824
1983	13751707634.3542
1984	19242006943.7812
1985	19247089840.6662
1986	13697808182.9124
1987	22891635196.2792
1988	32234874826.5511
1989	30277931172.3019
1990	14863616339.1262
1991	-778476374.19783
1992	-8201107966.11536
1993	-2028566448.28496
1994	10679504095.9706
1995	23714105442.0408
1996	27037123557.5074
1997	32320455171.7189
1998	25638431345.889
1999	38840658462.203
2000	65876074908.359
2001	53905166536.6534
2002	48327559838.5399
2003	63600407097.5246
2004	94263677908.3467
2005	118261245938.277
2006	131437028039.096
2007	139160541161.989
2008	136031327189.198
2009	19877760882.6571
2010	51119607101.0406
2011	90935071029.8463
2012	88161211839.6129
2013	98878141591.009
2014	107383670785.548
2015	36905043835.9627
2016	26199990154.8024
2017	53561369466.6472
2018	53922599793.5517
2019	59515574113.6663
2020	18726381362.2614
2021	130074511723.157