Annual base year varies by country
1960 4.767340632403324
1961 4.682183144220203
1962 4.640330689897812
1963 4.422943311964256
1964 4.3689303618725335
1965 4.349688284775474
1966 4.434670325167216
1967 4.540997788564533
1968 5.423245990695259
1969 5.4783826321858475
1970 4.303774864802278
1971 4.75766207626634
1972 4.8089090153838026
1973 5.3567492100815635
1974 13.410895853765867
1975 15.028398036525592
1976 17.51612725667243
1977 18.931673367627194
1978 20.841142909515845
1979 25.655185215262712
1980 35.35646417918353
1981 39.4971544576362
1982 41.990205317455946
1983 42.49269235529911
1984 42.10056405995334
1985 41.66318844212371
1986 30.46820669785837
1987 32.52221106163159
1988 29.61191360806473
1989 32.15197099825853
1990 34.43522402340055
1991 33.65613615355337
1992 33.556325807364566
1993 32.99785366344992
1994 33.35914307272086
1995 35.30008226296135
1996 38.06864376320201
1997 39.38573028175574
1998 33.89779568991851
1999 38.809040952296236
2000 43.05782334975435
2001 42.34883716651447
2002 44.871463957212505
2003 45.91096456940831
2004 50.987047286940246
2005 61.26076306985973
2006 68.35009612171866
2007 74.11568369678139
2008 87.22663895802624
2009 73.52051297046965
2010 86.15962754055016
2011 99.438638751446
2012 103.42835116549003
2013 102.50515188924798
2014 100.41055715787344
2015 83.90612718450711
2016 81.92556448033429
2017 87.15840944810617
2018 99.99999310168697
2019 97.97725290288697
2020 88.9784653120787
2021 100.8132241840353
2022 118.9434195404906
2023 115.41688194378223
