Year	base year varies by country
1961	6.84661021618941
1962	6.980481650823242
1963	7.237755442025766
1964	7.596457372167623
1965	7.777245161865691
1966	7.820268523994129
1967	8.339800383711655
1968	8.617220890232462
1969	9.098696775643186
1970	9.904325909161052
1971	10.659352951986769
1972	11.63478625193233
1973	13.294109699646473
1974	14.837848449155869
1975	15.499420205600408
1976	16.993087712595216
1977	17.648758778140625
1978	19.082257784658914
1979	22.471235717561665
1980	26.009359233006506
1981	28.77051775263169
1982	31.556907244379474
1983	33.0093886728245
1984	36.192189155549656
1985	38.132530450853615
1986	39.57040142615171
1987	42.977940015742355
1988	46.76083525713764
1989	52.63375769311509
1990	56.61546368474407
1991	61.79036842387515
1992	67.90725380013242
1993	73.75604361304082
1994	78.41829065295155
1995	81.66448701256999
1996	86.46928008590223
1997	91.45009910380324
1998	92.56572289881328
1999	88.77452188494311
2000	85.76132273035635
2001	84.23995796744008
2002	81.37421673597652
2003	76.48549983688534
2004	73.73899751394208
2005	73.62836297238294
2006	73.23456039563735
2007	75.53225855159785
2008	76.50014224878528
2009	76.21291082982181
2010	76.41919105443075
2011	79.39790853128461
2012	82.21240616676083
2013	83.7024641340301
2014	86.08824635201863
2015	89.22487959953942
2016	90.68664255248186
2017	93.2989620200145
2018	96.7133025989601
2019	98.6910442645857
2020	99.32099420731187
2021	100
2022	101.69019081164635
2023	104.91385626448721