Year	current US$
1976	2.2235535100540127
1977	2.162140223290211
1978	2.1041323272491503
1979	2.051346464786485
1980	1.4136107713410628
1981	1.3799281950755136
1982	1.346954841302028
1983	1.0954264303393686
1984	1.1326891353515929
1985	2.6930674487295962
1986	3.3097925089681723
1987	2.315110164787678
1988	1.8468769809714043
1989	2.8715241250871193
1990	6.037661213988544
1991	31.617074110857853
1992	45.070544813336404
1993	47.07284717670046
1994	67.93366359629808
1995	65.73306344746332
1996	70.07962666444678
1997	77.06450496364177
1998	71.42595519532811
1999	72.70367305030703
2000	75.71260599304156
2001	74.13246336621154
2002	73.58243672619645
2003	84.86942631346292
2004	86.48322148836088
2005	76.27219520846573
2006	70.663654898101
2007	73.27557638394093
2008	81.05511189096723
2009	91.83590206238317
2010	106.07137177971262
2011	122.98018840332071
2012	159.9119589919802
2013	151.31699033889285
2014	109.17303730269084
2015	79.71669653582512
2016	107.49764022364141
2017	247.28120426981295
2018	105.43961261317212
2019	96.0856062893523
2020	213.21753044075086
2021	84.24383630095896
2022	83.73141321239943