Year	current US$
1981	17878578.1013315
1982	246056289.99595
1983	-15712347.3209682
1984	-35080527.9153457
1985	-67854319.8480073
1986	-254144821.92586
1987	-421709997.793535
1988	-450913622.611971
1989	-222891406.670084
1990	3775480.70584738
1991	356186127.451039
1992	381842721.503678
1993	283949563.2486
1994	313055558.382267
1995	479954765.883993
1996	377951460.880308
1997	351521386.920015
1998	238817310.818356
1999	258480390.371081
2000	87673479.8409516
2001	76793049.2833669
2002	78099942.3456042
2003	241721886.443306
2004	510697421.695694
2005	794752546.191367
2006	1312392443.6245
2007	1458268654.20269
2008	1316290179.67022
2009	885052791.021621
2010	1409020556.11646
2011	2534025278.00554
2012	2604445472.92497
2013	2515459731.23056
2014	1927300578.97976
2015	404306006.486741
2016	326139858.16813
2017	493253882.744811
2018	1432691819.96818
2019	1330338646.50862
2020	558961090.569387
2021	1339275341.20837