Year	base year varies by country
1960	11.46016719172004
1961	10.22405985935137
1962	9.237588385048399
1963	10.866330092220394
1964	12.536395309357367
1965	12.959620921869094
1966	13.110010662081931
1967	13.08606777468237
1968	12.8698180465516
1969	14.844063155474968
1970	12.786548008724562
1971	11.646936237655613
1972	13.375918547315225
1973	15.17686246977962
1974	21.48775128049143
1975	23.092362584928207
1976	25.051509960149833
1977	28.854307107362942
1978	30.304589986534985
1979	33.548203095550015
1980	40.182684816326024
1981	47.00149886423145
1982	43.09452051289669
1983	37.90208993765827
1984	36.33098032533008
1985	34.653038724403
1986	32.29045638365549
1987	29.410822298964035
1988	27.985053077873655
1989	29.28252896602423
1990	29.437090919617365
1991	31.4202709228215
1992	32.4543435290521
1993	36.06035450225621
1994	41.47053473275727
1995	43.73914991368712
1996	43.818117545239176
1997	46.75847217481629
1998	46.10694915864544
1999	33.8728081762916
2000	27.543567887027358
2001	42.32224882857342
2002	45.916136765583445
2003	51.96425976340695
2004	58.40040123165491
2005	61.23701528387897
2006	64.00503883328092
2007	66.4833718674318
2008	72.35494357398206
2009	74.87839298851807
2010	80.16806902139658
2011	84.28227359204725
2012	91.2136761207033
2013	93.56382291985854
2014	95.30663697186988
2015	94.15013498833657
2016	108.22342401383477
2017	98.52551948138596
2018	100.00000092191819
2019	99.91279156538661
2020	99.34712467806594
2021	100.38328137871369
2022	102.7125515538165
2023	102.95380877958785