Year	current US$
1975	2888070147.0825925
1976	2963542083.3974457
1977	2901491810.5356355
1978	2992376895.306859
1979	3615759426.041826
1980	4603124003.825311
1981	4019013502.342243
1982	4102627359.072407
1983	3856746370.623399
1984	3830629204.5904236
1985	3843054489.639294
1986	4821721792.165142
1987	4837007980.522116
1988	5665955934.612651
1989	6213107939.587086
1990	7633338516.5604105
1991	6165269813.262755
1992	4814175736.660473
1993	3901321952.7427917
1994	4324416619.237336
1995	5095315904.139433
1996	4557338855.811545
1997	4344290459.283014
1998	3886292834.8909655
1999	3903939128.571437
2000	3722158572.5490274
2001	3580726851.1811066
2002	3752036542.745105
2003	4352705189.019599
2004	4699462952.123565
2005	4667826701.945523
2006	4344371929.411758
2007	6102738708.62747
2008	6300716428.124999
2009	5713028799.999996
2010	6033336550.000011
2011	6397426342.412464
2012	5978121690.234376
2013	6424106955.686293
2014	6592020891.764683
2015	5285719410.937497
2016	5563295045.1362
2017	5920659045.882363
2018	6580278528.627446
2019	6308238862.745088
2020	6666998687.937761
2021	7224177813.953372
2022	6639471663.42415
2023	7602399719.607978