Year	current US$
1974	112638844.706165
1975	57113198.2043303
1976	100183425.52539
1977	183138688.122039
1978	247576648.749146
1979	255666573.927416
1980	81318924.0808283
1981	-26335397.9201412
1982	-176454550.594545
1983	-189044877.796815
1984	-119335712.12992
1985	21001565.4458874
1986	-57298971.8975483
1987	165806265.362421
1988	398675691.301648
1989	150485510.556499
1990	355482462.081221
1991	333628725.351218
1992	311603937.468745
1993	707743199.522787
1994	845508941.344716
1995	870355245.907781
1996	775962615.932843
1997	1047866567.54484
1998	1195481412.32638
1999	1386691956.72774
2000	1083340547.64374
2001	1046760691.76022
2002	1068210352.33843
2003	1139982583.43146
2004	1327272229.29904
2005	1788227755.34602
2006	2145774451.52996
2007	2287564912.98323
2008	2208453248.28282
2009	1896644182.99735
2010	1847233881.37653
2011	2341256203.65116
2012	1978013804.47419
2013	1339038559.03136
2014	1846704536.60603
2015	3038470114.8917
2016	3203903018.57612
2017	4138401418.65583
2018	3453372635.0389
2019	3842435341.10951
2020	4187124108.12121
2021	4111126191.44007