Year	current US$
1972	328387963.727451
1973	379736411.3962559
1974	471852851.2713946
1975	604296399.9747906
1976	649077974.2294244
1977	710872047.7406158
1978	824133357.0233377
1979	1033956537.1777728
1980	1354508532.5811143
1981	1490118449.1857748
1982	1482830404.064181
1983	1302559124.8861287
1984	1265452923.3693302
1985	1240052578.6803408
1986	1369554515.719581
1987	1698863020.3224533
1988	2174936656.3498516
1989	2425021925.5295706
1990	2689949169.6920757
1991	2889143704.652313
1992	3204219913.7690644
1993	3181213300.3958116
1994	3221932289.97184
1995	3492116421.805937
1996	3802455272.038268
1997	4030810332.733522
1998	3952649363.7367883
1999	4149441759.820971
2000	4445987844.777729
2001	4302714780.465382
2002	4239016042.2424145
2003	4851932751.993008
2004	5657522686.754252
2005	6325345138.602476
2006	6627989442.890313
2007	7151380193.140032
2008	8356042064.380969
2009	8378083323.046733
2010	8858087832.144247
2011	9208010444.703262
2012	9307121222.122372
2013	9953709719.98462
2014	10674303270.812998
2015	11228865393.638784
2016	10671451838.371878
2017	11541186804.227861
2018	13382435688.890554
2019	14796089896.493593
2020	13644102669.269215
2021	15987829430.021603
2022	17702722121.30257
2023	18940097050.38413