Year	current US$
1975	2337508.04415623
1976	2281664.836810061
1977	1594578.433326689
1978	1095808.680952618
1979	9098592.949833442
1980	14418535.27569234
1981	3530055.188186745
1982	-1939044.3991448318
1983	3082583.403768707
1984	-2833987.967980908
1985	3728931.5368169844
1986	-1740168.0505145926
1987	3380897.926714066
1988	4176403.3212350225
1989	5518818.674489137
1990	-1541291.7018843535
1991	14667130.711480139
1992	-24400000
1993	6910953.114900811
1994	11485109.13339631
1995	9645502.9085666
1996	-11137075.523293393
1997	2187639.834932631
1998	4424998.757022821
1999	14617411.624322578
2000	3700000
2001	-22350000
2002	-7800000
2003	-2900000
2004	4600000
2005	4850000
2006	5058550
2007	5750000
2008	6850000
2009	8650000
2010	8550000
2011	9550000
2012	9749000
2013	9517400
2014	9517400
2015	9517400
2016	9517400
2017	9517400
2018	9517400
2019	9517400
2020	9517400
2021	9517400
2022	9517400