Year	base year varies by country
1970	11.018552118617354
1971	11.799194323968559
1972	12.613264488719711
1973	13.52416228176923
1974	15.147244954428427
1975	17.0200434769429
1976	19.01145475250269
1977	21.19043173434917
1978	23.383306654869553
1979	25.41897888210819
1980	28.60009591818936
1981	30.970597215258934
1982	33.75343443947397
1983	37.24058361733393
1984	39.85305184894917
1985	42.510646303776575
1986	44.4217184730241
1987	46.77923537042075
1988	49.85083271231748
1989	54.00379027539183
1990	59.361149602472885
1991	63.603309289074176
1992	64.1187895190962
1993	66.13739952206865
1994	67.83905466461448
1995	69.84539244323732
1996	70.99212864547027
1997	72.32756973543928
1998	73.0928892889289
1999	74.64193875653923
2000	76.2683967726271
2001	78.58639532630247
2002	80.57607938769958
2003	82.2969632785406
2004	82.98690182170283
2005	84.09536261814023
2006	85.44494242667682
2007	87.3557523729932
2008	90.25886079727209
2009	91.97973100188833
2010	93.13622628263687
2011	94.5654883462287
2012	95.608860601951
2013	96.5636982528853
2014	98.19768680391408
2015	100
2016	101.47259691790754
2017	104.00687924588551
2018	107.07946715205277
2019	109.54732124541677
2020	111.52940751153733
2021	114.14067443126707
2022	122.18886687950507
2023	129.77516313934882