Year	base year varies by country
1960	10.900545829792646
1961	11.225934992637567
1962	11.637457228209255
1963	11.934135622672311
1964	12.278665686662078
1965	12.60405512473724
1966	12.9007334984967
1967	13.532372020815977
1968	14.355415813277745
1969	14.853070078964702
1970	15.465567861377364
1971	16.307752192916077
1972	17.054233833656184
1973	17.743293845882903
1974	18.92043789196063
1975	20.31769867795904
1976	20.92062617869167
1977	21.820231860051003
1978	22.987805980020656
1979	24.327644864865036
1980	26.423535387184682
1981	28.873526584669474
1982	30.81629256470913
1983	32.51980215783791
1984	34.05104648145926
1985	34.9697928615092
1986	36.13588447666606
1987	37.29511260172989
1988	38.6808542914704
1989	39.56827575461849
1990	44.25760653196642
1991	45.63990324221857
1992	46.815760733651416
1993	47.698888939354816
1994	49.214885814564354
1995	50.58019653348617
1996	52.55866761516609
1997	53.25888058572733
1998	56.64622132557546
1999	57.480494277146185
2000	59.37451789622704
2001	62.64303227763337
2002	64.24029068510407
2003	67.07808810663661
2004	66.21131977589471
2005	70.57472688010807
2006	74.45130053470709
2007	77.2674090477514
2008	82.33758658595187
2009	86.44010260523513
2010	88.59600398663915
2011	90.69557543341666
2012	91.76508318888203
2013	92.84976041656742
2014	93.96447272717266
2015	95.82266196153023
2016	97.95144143569023
2017	100
2018	102.04611568543814
2019	104.50833769089604
2020	106.99802253028975
2021	109.99358186634365
2022	113.32977412321188
2023	116.99651299638201