Year	current US$
1976	533761515.0043651
1977	745549641.5707415
1978	486422284.88426924
1979	932922285.9320488
1980	1712282189.3535905
1981	1879309023.6873965
1982	1393714516.2725544
1983	1148542294.8689027
1984	1130895552.5644476
1985	720882997.5018865
1986	1122862828.657304
1987	979821186.8662506
1988	1133810237.7594833
1989	1190536262.7102594
1990	872387422.7032912
1991	629283110.5814625
1992	898800911.0197791
1993	1380735120.9792411
1994	1637069200.4626167
1995	1961296809.044843
1996	1893088857.5458412
1997	1893319887.165021
1998	1759109026.7983088
1999	2020763469.6755981
2000	1919464033.8504941
2001	1864923774.5932415
2002	2419323430.6983423
2003	3323272214.3864594
2004	3163751763.046544
2005	2028349788.4344158
2006	2542172073.3427343
2007	2196615992.436597
2008	6114362034.157338
2009	6739707042.253519
2010	7625776056.338031
2011	6416966056.338023
2012	5104139154.929579
2013	5662750000.000003
2014	6902651971.830986
2015	6175412253.52113
2016	5828593661.971834
2017	6032604929.577468
2018	7745508591.549296
2019	8996245774.647892
2020	7063622535.211263
2021	8189480422.535214