Year	current US$
1974	312255427.355507
1975	317309442.441588
1976	267640331.570631
1977	281496774.526846
1978	127279898.043394
1979	154620843.215829
1980	-105569477.13516
1981	76960464.299462
1982	157978216.83178
1983	72067863.3929294
1984	85853652.9125601
1985	123163422.114461
1986	55167654.5724373
1987	276574222.596722
1988	53191721.130256
1989	34614232.1866956
1990	-11806405.1848852
1991	-42534163.1845796
1992	-69033083.041559
1993	-347518724.168035
1994	-86932169.5480133
1995	-60838706.393164
1996	-117515753.847456
1997	-14525124.278723
1998	-8881783.66500461
1999	27761496.4758887
2000	15142213.7225714
2001	281521233.374846
2002	178374677.749545
2003	363236572.882337
2004	328601340.320539
2005	546368890.450766
2006	318531764.156308
2007	668289363.926894
2008	833398042.985049
2009	824429544.546865
2010	1054294376.78836
2011	715368893.34405
2012	1034693775.8035
2013	1051807167.88724
2014	1666023102.76552
2015	1850665769.7945
2016	2215463004.98337
2017	2822314998.93424
2018	3208975595.62491