Year	current US$
1976	751.0317503285446
1977	852.4732521954234
1978	1031.1084127400286
1979	1193.931190067871
1980	1087.793186314031
1981	1061.3605638911758
1982	988.9647450017571
1983	998.1815359317943
1984	943.9044882414838
1985	968.9567972889789
1986	1317.8789234885157
1987	1717.2291293471656
1988	1927.9052890515693
1989	1967.7121849566045
1990	2366.869873125508
1991	2532.725168016717
1992	2793.5900952462976
1993	2757.945701600311
1994	2898.706433544255
1995	3216.2275706590544
1996	3443.8754311165294
1997	3191.6613741933093
1998	3134.2776403437633
1999	3241.5300030746203
2000	3468.9993904390108
2001	3452.212850970511
2002	3624.279414580503
2003	4304.069867669869
2004	4863.480288302412
2005	4751.526338467768
2006	5168.706549838947
2007	6094.649444333752
2008	7248.640873142587
2009	6321.887413386566
2010	6872.940220453951
2011	7760.726581835517
2012	7767.903493329286
2013	8304.544829726665
2014	8839.161577941624
2015	8194.757438554445
2016	8599.24196401843
2017	9572.136458131676
2018	10358.526826839774
2019	10263.538099246516
2020	8094.482297754211
2021	8167.696742654623