Year	current US$
1960	1.0316199138375486
1961	3.790908477049042
1962	4.416314484585099
1963	2.8338999277421566
1964	4.043560395632822
1965	3.3214099963789665
1966	2.8734932150487755
1967	3.2487503213801787
1968	3.178187826926275
1969	2.8979823517287953
1970	3.7427876784747265
1971	4.410235601370834
1972	4.19027549467909
1973	6.622142694304111
1974	10.350758463033161
1975	18.054243440780024
1976	15.811585054836359
1977	19.40287887147253
1978	23.335170200256247
1979	31.346672273230944
1980	35.01098267322544
1981	35.08031194604149
1982	33.1191505236657
1983	27.767126431567622
1984	25.04852366263487
1985	21.14257515026417
1986	28.323287078960583
1987	37.134510647256626
1988	40.566897933180805
1989	35.53240759134946
1990	44.38485430038192
1991	39.901965370746524
1992	48.37001394251666
1993	33.17395864689606
1994	32.5548851981992
1995	28.502878406040647
1996	27.84809278486335
1997	29.694033488551412
1998	30.695908583262597
1999	29.610350853773156
2000	30.880313967413368
2001	35.99941098690651
2002	34.67146158954793
2003	46.22499063092253
2004	46.250242367279434
2005	37.841498040400865
2006	46.53734047809169
2007	55.47589505815001
2008	44.54235061467499
2009	52.332304202633914
2010	65.62348647786247
2011	52.60747258043239
2012	59.059596729251204
2013	69.70530058526595
2014	52.16064916859348
2015	49.19244557791461
2016	42.6068587319613
2017	45.952310007328094
2018	42.26512700500287
2019	35.50757236698673
2020	36.90167387742985
2021	41.17186100249347
2022	40.64109047449616