Year	current US$
1971	2329009336.1712
1972	3305450960.34235
1973	4916228689.80423
1974	30300572373.7759
1975	26057761565.0124
1976	37965315013.7241
1977	34155693883.5295
1978	24640421522.749
1979	37557580990.4247
1980	76029738903.9
1981	75759446335.5432
1982	39144492793.796
1983	18052899789.9664
1984	9674977368.80401
1985	2728778646.94153
1986	-155530832.354591
1987	-775596185.460337
1988	3275550817.0589
1989	732212503.838152
1990	4128060566.14371
1991	-4234315496.47003
1992	10460102017.5225
1993	6793775460.73098
1994	5218977694.36747
1995	11707089954.5718
1996	16986655039.7131
1997	19579016918.5096
1998	6597437908.80941
1999	24024365108.7373
2000	40017329626.2926
2001	32666682403.6434
2002	37913136223.633
2003	54765662769.1986
2004	82523506268.1563
2005	131237306982.3
2006	150681299968.69
2007	167113444721.329
2008	230784119633.229
2009	116195148769.644
2010	183869340202.728
2011	289560914401.744
2012	304175845413.126
2013	266794198017.087
2014	223548691715.048
2015	80949759988.1956
2016	98098676809.66
2017	131584683221.537
2018	210128452851.704
2019	191217107537.744
2020	86540823854.5711