Year	current US$
1980	219077105.621706
1981	151750991.311961
1982	101318602.087642
1983	53580861.8748718
1984	97160486.5263883
1985	104615473.793399
1986	183617662.58641
1987	72503904.9921684
1988	72117508.7329681
1989	-16309378.6044166
1990	-61752381.2270037
1991	-49609758.6841072
1992	-3388877.5434286
1993	69891046.7845965
1994	110720501.001537
1995	152999307.805668
1996	316601386.308226
1997	264195663.87819
1998	267218334.744801
1999	403737929.786376
2000	353935920.577618
2001	349434644.246539
2002	510847518.312312
2003	628787924.287646
2004	818608747.148334
2005	135512982.262897
2006	-79974174.5887555
2007	141909513.966937
2008	35865628.452134
2009	174093322.823491
2010	223291462.484482
2011	186527079.894363
2012	203159702.747626
2013	330344075.828463
2014	518588231.736266
2015	513164858.858684
2016	424385094.037529
2017	367955835.883015
2018	380543308.158021
2019	228058492.748851
2020	169056633.849907