Year	current US$
1977	-119757.15909405927
1978	2632606.0854406585
1979	2178527.476384382
1980	12036518.325203475
1981	12262486.856696334
1982	10853435.010746928
1983	9293568.10493552
1984	15541645.202932116
1985	13416486.544055257
1986	14366559.846628351
1987	13459787.981907042
1988	16191788.784818908
1989	15783684.446507465
1990	15984456.585460288
1991	2524467.2663652594
1992	425513.78917311964
1993	1439791.6439995647
1994	1622590.6616043418
1995	1974228.947698092
1996	3139225.40992266
1997	4404102.777241758
1998	2846664.338106881
1999	1263911.7390883577
2000	7572411.609975956
2001	6105691.3007993
2002	8202272.891501133
2003	9116915.729411628
2004	10992225.052803745
2005	15288134.997819733
2006	7378915.083363893
2007	10031194.77320195
2008	7410806.104457556
2009	7633819.975058279
2010	7014848.292771971
2011	6831617.091111265
2012	7985081.812920053
2013	8323655.225743669
2014	5480622.663636699
2015	9557580.62940898
2016	152392.11010292787
2017	-5382607.349408856
2018	5475145.172039701
2019	-1621915.6111162477
2020	-2953869.2024210556
2021	3817986.03140168