Year	current US$
1970	1159218.53427255
1971	1198042.73337876
1972	1438559.93604157
1973	2142766.79981203
1974	2556863.22987901
1975	2639880.97345134
1976	2944805.76897156
1977	4052095.50806804
1978	4636834.21246743
1979	5536199.83321458
1980	6586940.82290702
1981	5806435.33313234
1982	6846422.29990731
1983	6521606.99080407
1984	6694602.19999019
1985	9286063.09869281
1986	6211796.64981949
1987	5882139.92880465
1988	5578745.82903944
1989	5345349.17453452
1990	8747251.80860514
1991	21445571.8129874
1992	8347897.25372933
1993	21526749.7342552
1994	23935646.2361293
1995	12330129.1032344
1996	13314136.6104601
1997	12478034.2346228
1998	24726847.5720619
1999	11080400.3203131
2000	9935390.2780819
2001	9293206.76236044
2002	8247482.49869467
2003	7469764.65672702
2004	16048681.4754199
2005	18107189.3311645
2006	19525880.2377102
2007	24998668.6897451
2008	32106040.1997982
2009	28300726.5496691
2010	37229300.7532486
2011	36787983.6546
2012	33812222.392922
2013	35801976.2264444
2014	31933050.0174922
2015	35780374.703455
2016	38749687.0247276
2017	39277842.0773714
2018	43663140.7544473
2019	47443980.2387017
2020	47487878.5845903
2021	52858644.940992