Year	current US$
1960	2.655634586893007
1961	3.5749021337579436
1962	1.3581910278394589
1963	0.761718112128825
1964	0.9555926422902005
1965	1.4411554340947696
1966	1.0291873438153054
1967	0.992619444910847
1968	1.2871050554163066
1969	0.9006574509142979
1970	1.433511971458578
1971	1.2441195060401942
1972	1.4444325634188997
1973	1.580744456318938
1974	2.5603043332039066
1975	8.108013026886308
1976	10.46656841842455
1977	12.173573175573475
1978	13.658970337631485
1979	13.535815894379152
1980	16.829369841531
1981	16.688664858757086
1982	19.332444080596712
1983	19.50901867124095
1984	18.92504682973994
1985	22.114984009736872
1986	27.844281350830585
1987	32.33999832024051
1988	20.460623867486163
1989	27.428594608980386
1990	22.484124833003214
1991	24.14501452512781
1992	13.948524953055742
1993	16.419954797695326
1994	82.19108985281424
1995	85.8493325559042
1996	42.61064571926017
1997	35.476170043173916
1998	43.534861717082194
1999	26.04111836989217
2000	21.726687904888685
2001	19.975967133735594
2002	17.543057203441737
2003	21.190968418735974
2004	31.251502686506
2005	40.23639470174311
2006	57.36277331627767
2007	62.10814055493255
2008	83.61768350670546
2009	97.00083436284578
2010	293.5970049305315
2011	151.33742652807146
2012	125.96775613033098
2013	112.28017495046977
2014	103.9457419806468
2015	99.00454784709265
2016	100.02754880257693
2017	90.32504404870492
2018	92.36025260490496
2019	62.35418577783981
2020	78.53414690000514
2021	83.11633504622247
2022	76.88565198495752