Year	base year varies by country
1966	11.815340522099277
1967	12.277384010390243
1968	13.007106938209015
1969	13.859078474970804
1970	14.984446784556225
1971	16.16018917372476
1972	17.680060613675675
1973	19.40794465734806
1974	22.564055158999448
1975	25.059126067078548
1976	27.54216142579496
1977	29.88949961910273
1978	32.1186318492421
1979	34.83622927135
1980	38.21191174553401
1981	42.34538711011972
1982	47.03312541430129
1983	50.347873145227396
1984	53.583514120265576
1985	55.83441551389936
1986	56.53079767430383
1987	58.9748166786308
1988	61.406083858410476
1989	64.25519296034106
1990	65.72347076051373
1991	67.5541868598221
1992	68.18359338013349
1993	68.66384099153208
1994	70.13617306219764
1995	71.14823878081248
1996	72.25857239146436
1997	73.77716706529914
1998	74.89074602494345
1999	76.282280455035
2000	78.19202317447002
2001	80.23225029407949
2002	81.9134286385886
2003	83.00968465848926
2004	84.47785068340438
2005	86.13317197494642
2006	88.23953105054078
2007	90.6718198752893
2008	93.43619484267154
2009	93.98070857470415
2010	95.57124807014618
2011	97.05668170226325
2012	99.05007164453575
2013	99.42352417666665
2014	99.7825609751337
2015	100
2016	100.65746702595493
2017	101.77126173285504
2018	102.87566595702215
2019	103.95209172746857
2020	105.38992550129713
2021	107.6034832568011
2022	114.12987050632853
2023	117.43531330268644