Year	current US$
1960	0.20466703605777425
1961	0.09365470216187513
1962	0.29137249630267026
1963	0.6670265310343294
1964	1.6104720839347157
1965	1.29616628205216
1966	0.47814544021561783
1967	0.461094988022385
1968	0.25010560811629085
1969	0.45268745580393654
1970	0.8214978452618891
1971	1.6110405322767036
1972	2.1613513142484733
1973	1.223310352335902
1974	0.37622921725587216
1975	9.496780135474799
1976	1.6917593678937146
1977	6.590221699885493
1978	5.7661222810275845
1979	2.183797103221841
1980	0.9103980347396895
1981	18.679543067638757
1982	0.2502128458144905
1983	0.46095820702949064
1984	-0.12876347133006488
1985	1.2631827800463773
1986	1.7512765453634491
1987	5.2030305912019745
1988	0.3826377587175772
1989	0.6231872609262215
1990	3.5728077309345574
1991	30.957541102668003
1992	7.511283710066854
1993	8.742826914528422
1994	12.519709900295203
1995	15.884874918416651
1996	16.162235980037416
1997	9.938304531181906
1998	5.1081208247632635
1999	3.2236622480032437
2000	4.134580735779751
2001	4.825832740260972
2002	4.318359019473408
2003	84.51235217518509
2004	166.93558932461303
2005	768.5749577837785
2006	307.52927321332504
2007	321.1463707927113
2008	337.8780638119545
2009	91.00783778761229
2010	69.67339796256982
2011	59.135410900802555
2012	38.414328894336
2013	43.445936763707024
2014	37.262609137810664
2015	39.27504862122841
2016	59.122003005269555
2017	73.3827546442386
2018	56.67825653220762
2019	50.30781730476942
2020	55.44401429614655
2021	41.59270968751992
2022	35.27970501774851