Year	current US$
1970	3385714.39653296
1971	3385734.86493923
1972	4169428.43697343
1973	5041321.59670915
1974	4654992.9628328
1975	7048540.6453775
1976	8013394.43869228
1977	4931305.05416261
1978	5589562.30018294
1979	5873377.47534516
1980	5973866.89840893
1981	6884590.18699568
1982	7554569.8934517
1983	7213642.27673355
1984	7377356.5985192
1985	8200788.27264139
1986	8654293.42066837
1987	9493551.88487884
1988	9690728.99565396
1989	10058465.467909
1990	8275543.02979113
2013	45047523.7126256
2014	49501232.0535668
2015	52587763.0801193
2016	54549431.3068802
2017	55270575.3078862
2018	57703536.8551943
2019	63921975.7941835
2020	67843524.2004665
2021	75188104.2961793