Year	current US$
1961	3.4468553449270063
1967	0.6092058484665965
1974	0.016883991403486173
1975	0.4165791850378087
1976	0.7381284147938505
1978	0.01593191301889458
1979	0.7249243294759743
1980	0.7785445576621242
1981	0.3850596842510589
1982	0.3510850116809416
1983	0.6793355012878254
1986	0.43212101104923156
1988	0.02767438258861365
1990	0.1319076771455654
1991	1.216584371570512
1992	0.16587873655473423
1993	0.5281829460875828
1994	0.2849655924773111
1995	0.024413287118530417
1996	0.09623839961776597
1997	0.5098767961625925
1998	1.9522824252312754
1999	176.33437219014735
2000	263.29751385816866
2001	217.43536476324775
2002	240.8098191169882
2003	188.87021960147337
2004	170.44596236654337
2005	190.46478806865068
2006	210.28309831207244
2007	271.454097224615
2008	255.56144262184057
2009	195.75989295370513
2010	266.3791837534254
2011	247.73220736179667
2012	249.31528365583702
2013	222.6067705138534
2014	210.61248726495197
2015	176.055485623503
2016	182.67755895433794
2017	186.57776423111235
2018	164.56061869443872
2019	179.54793117392956
2020	192.26996792160122
2021	193.30144422532632
2022	166.6746173541068