Year	current US$
1977	742.1907752098036
1978	921.8397292199882
1979	1073.5217889399867
1980	1169.3673109622412
1981	1214.5504073521759
1982	1299.3928564029252
1983	1342.5094698577284
1984	1460.9137981162112
1985	1667.6787224107657
1986	1859.291750593129
1987	2137.293309373151
1988	2366.4860148352845
1989	2694.18328451002
1990	2807.7454437081683
1991	3014.874886113283
1992	3069.679774786663
1993	3032.2314621787086
1994	3151.1021654177875
1995	3288.2233184558763
1996	3499.527349106732
1997	3715.7205903664894
1998	4198.715561135523
1999	4512.224618016441
2000	4840.684064062573
2001	4821.784994674485
2002	4992.441407045355
2003	5435.151806211214
2004	5470.603314516533
2005	6308.665042135029
2006	6295.281171538064
2007	6790.634080041106
2008	7343.44526962639
2009	6810.440317844356
2010	6760.974884160811
2011	6775.749278229307
2012	6900.765075932444
2013	7205.2547652188505
2014	7726.378261759538
2015	8379.621847431563
2016	8849.513535007758
2017	9309.261296095676
2018	9574.310271137205
2019	9887.920742358343
2020	8437.536782312503
2021	9010.5127999358
2022	9762.414721039699
2023	10463.645939539985