Annual 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
