Year	current US$
1981	1328.237814515809
1982	1432.4875018497244
1983	1492.921975148791
1984	1121.3273621378332
1985	1138.9567958019402
1986	1470.2072309152218
1987	1494.2412127220255
1988	1545.234052683091
1989	1686.5921516391027
1990	1184.7629142332887
1991	1081.3341198129838
1992	589.1416940308203
1993	338.45655249636417
1994	402.2650747628661
1995	623.1574552138891
1996	570.9379004701381
1997	495.821891709157
1998	467.51393462995986
1999	435.41849442232655
2000	463.8538819031009
2001	512.8194699882853
2002	559.8277090126807
2003	633.9465596364915
2004	784.9120719510034
2005	986.0180408377469
2006	1322.6406751540442
2007	1625.3184737512343
2008	2134.94983195668
2009	1718.9140218275156
2010	2660.288175073983
2011	3793.7436552345807
2012	4402.304522667113
2013	4422.300876001307
2014	4211.9394355295435
2015	3919.3512134396938
2016	3690.756777598475
2017	3708.2482213466856
2018	4165.022821018949
2019	4394.94715044543
2020	4041.1741456436735
2021	4566.140130291822
2022	5045.504726020688
2023	5764.802812760631