Year	current US$
1976	-227421283.61994442
1977	-199837821.5855218
1978	-346175869.1206544
1979	-669590088.3352811
1980	-302425106.99001426
1981	-389186310.0840413
1982	-665263325.1251092
1983	-616394779.097662
1984	-524365026.7254503
1985	-776179917.6433322
1986	-345747872.65048605
1987	-141523788.70114252
1988	89769484.78727838
1989	206587118.15321213
1990	42488308.18186201
1991	107950756.83027203
1992	79285926.52739409
1993	337013297.23129505
1994	625161013.3104336
1995	795519406.3926941
1996	362341325.8110014
1997	250352609.30888575
1998	184626234.1325811
1999	301692524.68265164
2000	-364880112.8349789
2001	-355579752.9700994
2002	86177715.09167843
2003	-12552891.396332864
2004	-325952045.13399154
2005	-925105782.7926657
2006	-852045133.9915375
2007	-1241748942.1720734
2008	1638998290.7476323
2009	2585763380.28169
2010	4018311267.605634
2011	1815698450.7042255
2012	1147237746.4788733
2013	-777954225.3521128
2014	50460422.53521127
2015	989834788.7323945
2016	1388325774.6478875
2017	1690126056.3380282
2018	2884945211.267606
2019	3976056338.028169
2020	1589115492.9577465
2021	2455255070.42253