Year	base year varies by country
1960	2.956265333390634
1961	2.9573377684942903
1962	2.9658106634433095
1963	3.0110606386960996
1964	3.0682707909757174
1965	3.1367423654755173
1966	3.3676271296286977
1967	3.6558105918360964
1968	3.84771461859205
1969	4.037697053273867
1970	4.265881968324018
1971	4.411499108974201
1972	4.726152213434799
1973	5.658976794214186
1974	6.163759046383211
1975	6.303634001217512
1976	7.546588549870778
1977	8.107890611531325
1978	7.943262070423532
1979	9.222114717021004
1980	9.876083927906446
1981	9.747339064664072
1982	10.105924324884953
1983	11.991685797797334
1984	12.883662512067307
1985	13.09239566818092
1986	13.270042337833546
1987	14.327877027536259
1988	15.463251958095997
1989	15.070384360521667
1990	15.694031766335408
1991	16.791806514947087
1992	17.27473572804122
1993	16.843592447881463
1994	18.06527311174491
1995	20.928859311455493
1996	21.308064735121818
1997	23.10355931582514
1998	26.463707254886508
1999	29.392947014503516
2000	33.24413380679516
2001	35.54260463022399
2002	39.91094409827071
2003	42.1217459699639
2004	41.282524138781994
2005	46.31171779672791
2006	74.33692313362897
2007	76.41482737929364
2008	85.32895422874076
2009	81.16549005904115
2010	89.21480248480954
2011	97.09529606920256
2012	96.53727048155409
2013	100
2014	105.43739265412782
2015	104.1393334949523
2016	106.76140147114536
2017	114.9815329849678
2018	126.24697016945741
2019	127.59041825997292
2020	129.6734865140517
2021	145.12357208614367
2022	167.53849168863206
2023	163.32485057386967