Year	current US$
1977	161700392.809448
1978	203861450.155245
1979	118253380.877206
1980	96858561.1748359
1981	122945750.836962
1982	156989144.721227
1983	154071461.63062
1984	160108470.805653
1985	129204833.554437
1986	104444737.350669
1987	163599245.270747
1988	245277192.712797
1989	264541654.431192
1990	307794171.990677
1991	382499179.03616
1992	90894649.3518301
1993	95164777.0345345
1994	64562209.0399207
1995	104877618.937901
1996	150641482.20688
1997	33357745.0389389
1998	224179373.83431
1999	76732640.5054667
2000	165942286.997749
2001	173928781.888075
2002	190955652.384603
2003	168200836.429257
2004	159222949.72704
2005	83862442.0750178
2006	299928418.636813
2007	888171074.351191
2008	764745612.926053
2009	1204473478.83545
2010	1280730529.89627
2011	818782125.599642
2012	131021543.218694
2013	765439946.63707
2014	771426410.023912
2015	518339481.698522
2016	304316019.426432
2017	765756040.647558