Year	current US$
1975	277745397.7462903
1976	360768050.0858326
1977	497972959.23553926
1978	606584939.2892948
1979	821765628.742515
1980	1358664013.2669983
1981	1321842817.2942817
1982	1387106288.5326755
1983	1382085650.7230256
1984	1528712761.7148557
1985	1429846928.9827254
1986	1496618983.0508475
1987	1862396345.9196103
1988	2289354454.2032623
1989	2732346863.9053254
1990	3192962740.0768247
1991	3294451136.363636
1992	4191531290.743155
1993	3158397055.3592463
1994	3570773571.4285717
1995	6717504527.813713
1996	7072548306.148055
1997	6738597491.448118
1998	6785841628.959276
1999	6748355987.055016
2000	6743650329.877475
2001	6617244990.892531
2002	6993294230.769231
2003	8181782559.456399
2004	9875106250
2005	10364178584.753138
2006	11315149918.454397
2007	13905730906.10457
2008	17498754943.60627
2009	14083954983.441967
2010	15110295846.386467
2011	15800753605.325535
2012	14293541210.961866
2013	14287081057.68038
2014	15071910480.732517
2015	13390800947.008394
2016	14424827081.114944
2017	17021058792.252434
2018	18829485905.11962
2019	19578776286.720585
2020	20698582057.30506
2021	25193301786.470844
2022	27706029794.79052
2023	29094019338.490482