Year	US Dollars
1967	12151339.409
1968	104631629.46964
1969	150467962.56299
1970	138468922.4862
1971	101299326.27526
1972	57321521.62585
1973	61020815.51183
1974	427331210.19108
1975	353502316.15518
1976	418934279.0967
1977	390851476.54893
1978	262883902.72148
1979	759698899.82629
1980	1495656629.99421
1981	1930804574.40649
1982	1162999420.9612
1983	1236247828.60452
1984	1120440359.00405
1985	1265200057.90388
1986	-123036387.43456
1987	1547464499.3498
1988	725617685.30559
1990	2293888166.44994
1991	944083224.96749
1992	1141742522.75683
1993	624187256.17685
1994	1061118335.50065
1995	1170351105.3316
1996	2145643693.10793
1997	1812743823.14694
1998	-1092327698.30949
1999	1747724317.29519
2000	5420026007.80234
2001	4351105331.59948
2002	4267880364.10923
2003	3669700910.27308
2004	3097529258.77763
2005	8460338101.43043
2006	9120936280.88427
2007	6941482444.73342
2008	12972691807.5423
2009	7737321196.35891
2010	14333418985.6957
2011	20184001300.3901
2012	23502730819.2458
2013	20851755526.658
2014	22621586475.9428
2015	6005981794.53836
2016	3761768530.55917