Year	base year varies by country
1960	15.795791939616096
1961	16.009059439959504
1962	16.20831375081416
1963	16.384722770356724
1964	16.63113911739617
1965	16.950428018876394
1966	17.44178338782454
1967	17.991422708709752
1968	18.777142005549795
1969	19.708204423055236
1970	20.745393709270367
1971	21.797145236954478
1972	22.740117348221673
1973	23.986258369348057
1974	26.14470812435563
1975	28.566437707406973
1976	30.138589296408004
1977	32.01120012543092
1978	34.26284574428548
1979	37.105538798715806
1980	40.45732122316027
1981	44.285459342699426
1982	47.021594000372374
1983	48.863386946640475
1984	50.62631897587052
1985	52.22738909958271
1986	53.27919259021571
1987	54.59912516264761
1988	56.525109225982106
1989	58.74132280504618
1990	60.94020383496797
1991	63.001086556507644
1992	64.43678955547837
1993	65.96415078208999
1994	67.37261628611793
1995	68.78521017489409
1996	70.04450542483984
1997	71.25238646522075
1998	72.0531675436637
1999	73.07279056088166
2000	74.72803188814582
2001	76.41067544657705
2002	77.59809326239142
2003	79.13012382828427
2004	81.25800217856333
2005	83.80580991059232
2006	86.39024426144637
2007	88.73077928568279
2008	90.44036381617421
2009	90.99818253888195
2010	92.10407133202024
2011	94.00427915492932
2012	95.75479387229167
2013	97.38442590360648
2014	99.08049064555333
2015	100
2016	100.95032247921247
2017	102.75814416993067
2018	105.1122205016102
2019	106.87653739963119
2020	108.2879686128108
2021	113.25269622803047
2022	121.22684795093551
2023	125.64556080013047