Year	current US$
1981	16174657286.0328
1982	17634994943.6163
1983	20533264455.3665
1984	26190020891.8949
1985	35300368164.932
1986	22885741846.6371
1987	22218545498.6196
1988	24529024488.8616
1989	13146862789.7799
1990	18679292874.5905
1991	19107645866.9774
1992	21245260415.8974
1993	13029483088.3002
1994	17629756400.153
1995	23269777464.4684
1996	28945449935
1997	29827358921.617
1998	33308366237.5
1999	30911744983.9232
2000	28276814657.8129
2001	44612231932.0191
2002	61650461332.1479
2003	68710672111.0272
2004	81126009603.5759
2005	106133844073.059
2006	119333740307.357
2007	182385124972.081
2008	202661939215.157
2009	198766168806.669
2010	244027897044.538
2011	275698897188.122
2012	274795822935.833
2013	381190287254.817
2014	414781153032.495
2015	390920607879.431
2016	329932131575.355
2017	300241928787.753