Year	current US$
1977	1469340509.306105
1978	1900451348.2186747
1979	2331787747.798006
1980	2578274636.1720057
1981	2592561842.047956
1982	2570450203.168153
1983	2278023722.49374
1984	2448140065.9232087
1985	2441624567.4052258
1986	1915226182.838953
1987	1346257274.872029
1988	1239271202.583366
1989	1116505864.558218
1990	1164497939.810268
1991	1008830515.011877
2005	4541999999.9997835
2006	4533000000.000236
2007	6357795646.181968
2008	10484250655.093134
2009	11158764683.24522
2010	11489013634.549961
2011	12034434292.143215
2012	10469965825.046158
2013	10275706651.690002
2014	11242734669.20541
2015	10515018740.256956
2016	10394480707.36562
2017	10792752174.763391
2018	11429525984.8702
2019	9432716816.585546
2020	7149010860.950445
2021	6429761984.568701
2022	7320585022.617688
2023	8030218081.442443