Year	current US$
1981	97298545688.855
1982	81639049290.5013
1983	48367348117.1199
1984	32218231737.6681
1985	27999966148.6796
1986	22405969666.5707
1987	24720336135.7145
1988	23721843645.7512
1989	18137173277.2437
1990	64059604543.9345
1991	58596650288.3298
1992	47816541016.5527
1993	36528244116.3478
1994	34190994867.6609
1995	41006406338.5797
1996	44360564312.6454
1997	48289822847.3969
1998	41570914588.3646
1999	50364636454.8329
2000	72534761800.8151
2001	55443244765.0956
2002	64230275143.3441
2003	73666031737.9416
2004	102152984095.916
2005	140145867881.235
2006	215003304943.094
2007	198876454015.749
2008	301395675806.502
2009	187853335800.52
2010	262392640602.983
2011	336864062652.563
2012	392367792357.522
2013	320487446435.33
2014	348750524565.958
2015	223854963768.589
2016	187365977863.407
2017	239286889476.288