Annual base year varies by country
1960 3.2176097325596333
1961 3.264487181749782
1962 3.2840421327174694
1963 3.2839612481652507
1964 3.4277851067556173
1965 3.511793958902951
1966 3.2493131509465383
1967 3.315574641814761
1968 3.428240196412507
1969 3.508859506742476
1970 3.6108051943623996
1971 3.66765480688475
1972 4.684006622999259
1973 5.27175924013553
1974 6.375368674688681
1975 7.236504796162654
1976 7.897499481458195
1977 11.357018690543647
1978 11.305317059310118
1979 13.228347913682112
1980 17.33388759101282
1981 18.607347955491075
1982 18.928533907198876
1983 19.531787157534023
1984 20.143765939875756
1985 20.6029251954085
1986 21.78690891119379
1987 22.587321461311216
1988 23.474721425869518
1989 23.973739045082095
1990 25.50090877944944
1991 24.97988525542803
1992 26.146010062787234
1993 26.937793002858818
1994 27.653269834243382
1995 27.0800368018563
1996 25.43349821845856
1997 25.655953736989762
1998 28.327196132022102
1999 28.90978308972111
2000 29.271717717346124
2001 31.073907589179694
2002 32.1966580094527
2003 34.11134006895833
2004 42.52801303494556
2005 42.72306568734382
2006 43.33927945317963
2007 48.14100971131076
2008 63.510660609367456
2009 81.4092118525371
2010 79.68357228463196
2011 80.53170939193069
2012 88.93703251182068
2013 93.95328705106148
2014 100
2015 98.99681358128642
2016 96.72526391164567
2017 98.98137149148806
2018 102.3936374418642
2019 102.52362640891772
2020 107.88605147138117
2021 110.8529825516109
2022 112.5405983165096
2023 111.49114655354926