Year	current US$
1960	2.620543857819084
1961	3.418146448967086
1962	3.8101705834886954
1963	3.6893482976320238
1964	4.018269977766985
1965	4.2168944009946285
1966	4.401444310368499
1967	4.728546029327676
1968	4.13372613419047
1969	3.9358251484940867
1970	3.9900230075050933
1971	4.493749924343532
1972	4.691751509557028
1973	5.667471581415771
1974	7.941872699172406
1975	10.383664384802302
1976	9.313975831160269
1977	10.800161029348128
1978	14.214260759585033
1979	17.64139669971076
1980	19.86036461846657
1981	18.709702448982874
1982	19.058868701983712
1983	17.874242519292412
1984	19.200683252663016
1985	20.540341579419046
1986	23.858024703290155
1987	26.960716604156243
1988	29.658450945242983
1989	30.84665279934724
1990	34.535162006963105
1991	33.58255151595143
1992	35.310668485052524
1993	31.013762506740854
1994	33.43416792840823
1995	31.62331912021009
1996	27.01770758709063
1997	23.98441747140625
1998	22.719450155280338
1999	20.227647440924013
2000	19.453899264244765
2001	20.732702028923875
2002	26.916753838670033
2003	34.232056373405605
2004	35.481352182702274
2005	42.81559788063831
2006	52.273197734096264
2007	38.61206943270957
2008	43.4391706113786
2009	45.73646967891301
2010	50.42400535954016
2011	52.342302142052006
2012	50.319367638567584
2013	49.94550810072748
2014	47.33510672676541
2015	44.386242942682635
2016	42.768386773889986
2017	46.59461062681435
2018	46.588818224508415
2019	47.327024679398754
2020	58.16926020778521
2021	53.51738863002833
2022	49.31918173333394