Year	current US$
1981	145378805191.923
1982	122127025080.354
1983	74544872790.8741
1984	45757533968.3787
1985	37014902671.2709
1986	30862776763.9614
1987	29597450060.8172
1988	24348554989.271
1989	30277460228.2211
1990	34697189796.641
1991	29411060026.6378
1992	25571002832.7865
1993	14126478309.0508
1994	15604772947.5899
1995	20278833601.4781
1996	21664944663.75
1997	24133510107.2221
1998	20544513265.9091
1999	27639520642.0752
2000	39697238064.3341
2001	27944468207.2402
2002	32456722541.8857
2003	35202779855.5049
2004	48730303629.3721
2005	61995746756.9814
2006	104667925779.449
2007	67198508054.7278
2008	102594638671.908
2009	67866549788.8876
2010	87181542313.271
2011	99461177092.9198
2012	146781948485.518
2013	96929036862.601
2014	116967249665.411
2015	70584254374.9932
2016	52929925152.273
2017	58127273865.6353