Year	current US$
1975	347.751229929506
1976	316.43595160179916
1977	356.1862957722714
1978	431.97306028660034
1979	462.8417094488678
1980	550.7308333448017
1981	642.690594658209
1982	640.3334441107854
1983	627.5864753298476
1984	662.203979937185
1985	618.8106054760422
1986	702.485172901927
1987	838.540470004705
1988	1089.017320652056
1989	1080.97109125011
1990	1150.2812966807855
1991	1335.230193383103
1992	1380.8814280684114
1993	1391.9700517937483
1994	1965.1962400277744
1995	2089.1971728365725
1996	2216.6832311540757
1997	2135.8605606608317
1998	1889.6706507740457
1999	1953.3713547676339
2000	1996.5155775804326
2001	1754.8418797262443
2002	1760.6670343002263
2003	1937.0423447514818
2004	2195.986397343039
2005	2478.4270468674895
2006	2751.960282503177
2007	2799.3681815189734
2008	3221.080519168851
2009	2915.4939038995194
2010	3416.110698989394
2011	3852.144461925815
2012	4378.571528275374
2013	4208.187890832389
2014	4125.425453634259
2015	4117.931046942048
2016	3978.4376856148415
2017	4367.25660339844
2018	4649.61330094975
2019	4878.97868604087
2020	4605.970841191367
2021	4425.971491985162
2022	4681.679407112443