Year	current US$
1981	147018018269.024
1982	122697991245.12
1983	73555718558.8281
1984	43323650570.5683
1985	34214703354.709
1986	30114868059.3225
1987	26364299922.2657
1988	21723575607.9692
1989	23096082441.6673
1990	28704999800.9074
1991	23773411071.3394
1992	20921939324.5624
1993	12343171434.8786
1994	14232829108.6458
1995	16393851360.1478
1996	18684386151.25
1997	20923931721.7156
1998	22143799687.5
1999	22726649585.599
2000	23646805153.1358
2001	22237198993.4488
2002	25533501916.5985
2003	29764459418.8005
2004	35546624782.5236
2005	43973856175.9613
2006	61780148322.9526
2007	55621364639.4787
2008	63564113110.5225
2009	61631832061.0174
2010	61099012913.6782
2011	64325323410.1296
2012	65282482043.7411
2013	72964163343.1059
2014	85749726884.3273
2015	73332715868.2459
2016	59584461733.3091
2017	55293265338.2173