Year	base year varies by country
1960	1.6539770925664898
1961	1.64621833390282
1962	1.6913414006286969
1963	1.7177579804638992
1964	1.6531627000341276
1965	1.6407091570223538
1966	1.6391581187420734
1967	1.6533314089376434
1968	1.681354487241165
1969	1.708185827252502
1970	1.7721628206571847
1971	1.7814618040011558
1972	1.7825570046183898
1973	2.033863119440014
1974	2.456710489258261
1975	2.742594262435431
1976	3.029846524407426
1977	3.3686563010543695
1978	3.6592145779580023
1979	4.063024688306197
1980	4.53062601825574
1981	4.9620530448803954
1982	5.174665472485458
1983	5.539562431660409
1984	5.78112040408229
1985	6.911132740047245
1986	9.423127201587583
1987	10.662340855079517
1988	11.77882876948213
1989	13.082092002435102
1990	18.587074498698467
1991	24.275765984470354
1992	26.94301702254795
1993	30.50372102499152
1994	33.84420567041172
1995	36.48321477850291
1996	40.0700473912548
1997	42.74207824454118
1998	46.285325062736895
1999	48.86492179951486
2000	52.89615055379421
2001	51.942219778492216
2002	55.35231494863157
2003	58.34312018980076
2004	62.423586287639466
2005	66.52200628644472
2006	70.07356426264614
2007	75.17188717084595
2008	83.10142910138511
2009	83.91389629057899
2010	88.04858819239413
2011	93.17459691116335
2012	96.5152305287825
2013	100
2014	102.66280504011947
2015	103.55899226348258
2016	105.43836370986467
2017	107.27967810737779
2018	109.41645521188713
2019	112.02286296223629
2020	113.4136840607147
2021	119.97771495641045
2022	130.742157957959
2023	135.11833201403672