Year	base year varies by country
1966	13.35265480126377
1967	12.85259245337326
1968	12.559812984680837
1969	12.937631540461114
1970	13.38626958567751
1971	13.930447877532655
1972	14.429745768312122
1973	15.301214823481962
1974	18.9579352289679
1975	19.13449350520419
1976	20.086739540376602
1977	22.250275533569315
1978	24.123128680395126
1979	25.8948781758446
1980	34.446177831474614
1981	37.708395150811896
1982	40.08340280061657
1983	42.877295354951116
1984	45.536182230055026
1985	49.61333002366294
1986	53.32974028763371
1987	54.937529789603055
1988	56.95406486365352
1989	58.617111628989235
1990	63.12732299789852
1991	66.53387294703418
1992	69.58636607993029
1993	71.69830008731853
1994	72.16816789209777
1995	77.60849518185822
1996	77.9464713055882
1997	78.50253491750935
1998	87.65370903499104
1999	87.54838770720629
2000	86.00088355780709
2001	86.52937869158185
2002	87.35967942617187
2003	88.11132931977043
2004	88.91626612104015
2005	89.70426107847959
2006	91.00081667245696
2007	93.8869477258973
2008	98.42205007371084
2009	97.97663244410221
2010	98.61103216544672
2011	98.02050502141505
2012	98.54312336123041
2013	99.78502537409517
2014	100
2015	103.17293530967125
2016	104.17359296543334
2017	104.11016060805103
2018	105.0879441192869
2019	105.94630818096145
2020	106.09719475397081
2021	108.63773148974687
2022	111.95282478357463
2023	116.63603921142996