Annual base year varies by country
1960 0.504470849199556
1961 0.5023624617456046
1962 0.5407439029305569
1963 0.5796255694018971
1964 0.5918339672270353
1965 0.5855791146693865
1966 0.5717670013070448
1967 0.5819805183763815
1968 0.6054490450750637
1969 0.6225861828676946
1970 0.6357333746611811
1971 0.643261979920683
1972 0.6948990778226507
1973 0.7262139873089537
1974 0.854820510578372
1975 0.9996851379279621
1976 1.028348624539325
1977 1.1371104344657161
1978 1.1490280211715613
1979 1.276694044030316
1980 1.4539554083446746
1981 1.5592540470585206
1982 1.6763856046051657
1983 1.7869666753196616
1984 2.219131886625433
1985 3.070552633955444
1986 3.358793733283371
1987 3.843230832194075
1988 5.516414868455347
1989 6.818774796961493
1990 10.259478310624418
1991 20.822785042736484
1992 21.98225811231575
1993 23.077801772237553
1994 25.416939066213224
1995 27.870280134654664
1996 28.893046073057437
1997 31.62382401706164
1998 33.68085929370637
1999 34.97223544308869
2000 37.49295121869468
2001 39.757802483599505
2002 42.50930833526342
2003 56.73357782956824
2004 82.35804149202941
2005 87.1193672832795
2006 92.90517770912562
2007 100
2008 110.39168751391848
2009 114.25335053980912
2010 120.47263263641213
2011 130.18363660628836
2012 136.82063474236844
2013 143.24137968019198
2014 149.4312535744877
2015 153.12502377699673
2016 156.17784439984416
2017 162.7082257936723
2018 169.41422853961006
2019 173.69298590232214
2020 181.8973810731433
2021 196.04382799963983
2022 217.04826887539986
2023 230.99127559931566
