Year	constant 2015 US$
1976	2946.063828262236
1977	3094.6419413415892
1978	3439.6878818652317
1979	4021.1956611055457
1980	4311.989152962503
1981	4856.131602963345
1982	4981.997909552713
1983	4661.358319126502
1984	4648.548538825528
1985	4322.914259392116
1986	4357.668969521505
1987	4259.391944133605
1988	4126.634998353876
1989	3512.781794910747
1990	3332.3601716258927
1991	3214.3802062744835
1992	3485.0453925894626
1993	3454.8058121888603
1994	3454.9821870063747
1995	3521.05230670796
1996	3477.169726047586
1997	3497.361296800523
1998	3520.353714546361
1999	3561.475342227866
2000	3635.2921580234793
2001	3747.464937527673
2002	3879.8837491332743
2003	3951.0410456245627
2004	4183.8510536142
2005	4408.270261058258
2006	4453.653828670018
2007	4521.653170611255
2008	4731.612828864209
2009	4861.126992024886
2010	4865.469773070585
2011	4872.99655954255
2012	4920.865178930783
2013	4732.38722080538
2014	4348.236658849694
2015	4064.2530104364205
2016	3949.6107851941288
2017	3947.971669666409
2018	3929.6871847293633
2019	3909.2500172664204
2020	3784.7625230743733
2021	3845.856975068703
2022	3891.2122257983224
2023	3974.9593936712417