Year	base year varies by country
1960	6.386535805269741
1961	6.727690371293694
1962	6.995045085671523
1963	7.355052783103404
1964	7.882834335771732
1965	8.278811959933748
1966	8.669890091034059
1967	9.308172980469845
1968	10.431089235387955
1969	10.864013433676861
1970	11.282125112811407
1971	12.112952362914372
1972	13.111552825965529
1973	14.917281058930223
1974	18.2097334305717
1975	20.68042825074361
1976	23.39466864421079
1977	25.59813394467781
1978	27.506267309536636
1979	29.790657786423978
1980	32.66116119515958
1981	36.46089746659643
1982	39.761263353460286
1983	43.0178820773839
1984	46.64962172444786
1985	49.083140916522005
1986	51.41467655163364
1987	53.61732451799358
1988	57.736823093826196
1989	61.50711810031222
1990	64.70266040688576
1991	65.68081327236311
1992	66.26389257968205
1993	67.43404747480311
1994	68.6784827753224
1995	71.56374357335812
1996	71.5077263620953
1997	72.9953886693017
1998	75.25674021138902
1999	75.95439719919807
2000	77.19840219076394
2001	79.74855945521216
2002	80.5015966299993
2003	80.65448824589284
2004	81.14056159216592
2005	81.89430971123389
2006	82.6483297959808
2007	84.92387031169137
2008	87.50320932935152
2009	89.0554333285967
2010	89.34302063299855
2011	91.68696457513313
2012	94.41370954107414
2013	96.82909028870395
2014	98.40897632252357
2015	100
2016	100.08742545829345
2017	100.90740459989478
2018	102.9274056308471
2019	104.4677700348432
2020	106.17548273139661
2021	108.7215253560957
2022	114.5748710595587
2023	120.07170784028787