Annual base year varies by country
1960 4.12414369012187
1961 4.247458203831838
1962 4.375086669571378
1963 4.506948157285754
1964 4.637928090890069
1965 4.780723765684625
1966 4.782712700902546
1967 4.841432543802775
1968 5.121935461499155
1969 5.216891937164992
1970 5.372921261522399
1971 5.322357028824572
1972 5.456034222341333
1973 6.17775673617317
1974 7.82685770397758
1975 8.164504718537238
1976 9.652320229190238
1977 12.42748698703576
1978 12.978435343580152
1979 13.827406341109311
1980 17.16585068067228
1981 17.676876537695986
1982 19.144290199004903
1983 20.87623238142421
1984 24.615143867062432
1985 24.69973554796539
1986 24.20070089645125
1987 23.21447228772385
1988 23.1260423235453
1989 22.891912762355688
1990 21.85644892892814
1991 22.001464121750928
1992 21.996219602547896
1993 23.34990969354147
1994 34.18101501709524
1995 37.95589448465668
1996 59.3189052191571
1997 61.645080783850915
1998 64.9661240652394
1999 64.46204415852021
2000 65.49409262922522
2001 69.99744600256832
2002 73.20482512141392
2003 75.60456764188666
2004 73.71191501232686
2005 74.60761424636775
2006 75.62193330662257
2007 77.95755410860922
2008 82.14616163740031
2009 83.13830597113157
2010 84.39886386814011
2011 89.21746550477886
2012 88.8569391891795
2013 91.41311379669074
2014 95.44199353842411
2015 100
2016 98.82016756434304
2017 97.79078036228998
2018 99.43559827941894
2019 101.4077566963298
2020 103.26187897573116
2021 107.32020648010445
2022 109.55879715285295
2023 112.28152729419423
