Year	current US$
1976	45000000
1977	55000000
1978	55000000
1979	59000000
1980	59000000
1981	65000000
1982	64000000
1983	77000000
1984	58000000
1985	45000000
1986	60000000
1987	77000000
1988	95000000
1989	118000000
1990	122000000
1991	118000000
1992	173000000
1993	250000000
1994	222000000
1995	300000000
1996	319000000
1997	342000000
1998	0
1999	630571333.597043
2000	545099711.90963
2001	536152678.481654
2002	411733893.824207
2003	379474780.250991
2004	496954583.841589
2005	902051035.971895
2006	982316113.003739
2007	1459483045.07014
2008	1912066619.81855
2009	1844438806.03417
2010	1931819013.07155
2011	1941807064.30084
2012	1437386208.76627
2013	1291061264.93958
2014	1424499197.40175
2015	1870201142.47101
2016	1800318875.52917
2017	2083354726.70232
2018	2287128999.21002
2019	2666198439.3111
2020	2725263243.97498
2021	2937563888.47747
2022	2937323542.57294