Year	current US$
1960	1.6417520969705577
1961	0.9629281719405423
1962	1.2581662176788129
1963	1.8095112824536388
1964	0.8998299932349132
1965	0.704495679121524
1966	0.6751237386148513
1967	0.503930231165389
1968	0.5955281110912867
1969	1.0739144287390838
1970	0.8440810053354678
1971	1.46301518589653
1972	1.5529587893487726
1973	2.4169085357219537
1974	2.241870812986496
1975	1.8013281927508207
1976	2.1036555853736494
1977	2.9101940018711283
1978	6.712007607976529
1979	10.424480461479067
1980	8.80093008375621
1981	7.636741185392519
1982	8.095252322322812
1983	7.95471782996981
1984	6.711589870546598
1985	8.44580736200829
1986	9.917401873750425
1987	8.221133615211226
1988	10.283195069947956
1989	3.7812662506941166
1990	3.854406994476822
1991	4.291241890174326
1992	2.7722129613135404
1993	2.477487570069179
1994	4.184272334147426
1995	3.7418213845490778
1996	1.1380968199161445
1997	1.3881546679799093
1998	1.6270486858920143
1999	1.799446251280877
2000	2.3198038827958825
2001	2.731076244185841
2002	2.560873704353378
2003	2.664291535368812
2004	2.607816846126339
2005	3.034711517935002
2006	3.0300527466189986
2007	4.04350053142335
2008	10.970565682869484
2009	7.262142615604435
2010	7.18592657890816
2011	7.630357656752504
2012	10.04675893362727
2013	77.71470068862482
2014	27.107772202945245
2015	22.696394171317355
2016	29.612458556842164
2017	29.49682350450381
2018	32.50369328919235
2019	38.531897086579896
2020	53.72684745989242
2021	28.003972382989513
2022	18.518879272013375