Year	current US$
1977	-145566037.755064
1978	519099779.928068
1979	479343701.443541
1980	-133212242.364393
1981	178775307.36603
1982	1134144306.86297
1983	1104277871.5068
1984	1430205181.24102
1985	1621651550.54628
1986	2234586491.68478
1987	1597192856.51425
1988	1566605501.36645
1989	1124289314.02651
1990	978710535.640953
1991	739151336.831195
1992	223365936.540906
1993	1121321467.65708
1994	719085019.30964
1995	1106897043.46379
1996	765985435.817954
1997	849477501.432915
1998	850639900.189981
1999	776223281.322168
2000	486379030.756025
2001	229260075.819287
2002	183670330.490515
2003	595704798.679187
2004	1187096544.59739
2005	1215284053.42536
2006	1787643626.08991
2007	1911425430.56566
2008	1717902680.49633
2009	963625077.53561
2010	518199318.586809
2011	596462746.727627
2012	482681406.123578
2013	863272751.93525
2014	1423047033.4509
2015	692755594.558596
2016	1617658110.96903
2017	1787442072.7849
2018	1727564380.67301
2019	1214086614.45307
2020	820410382.670553
2021	1345222314.4136