Year	base year varies by country
1970	32.38461399860565
1971	34.633477645727815
1972	36.10785484901859
1973	38.51443822206749
1974	41.72471143447131
1975	43.78016096704883
1976	45.427545408461846
1977	46.84043775897717
1978	48.12387897682701
1979	50.68131627410428
1980	54.296358876881214
1981	57.31046528345014
1982	59.6454712224679
1983	61.13137075828621
1984	62.62650702639749
1985	63.86926582450517
1986	63.859365648561536
1987	64.05052725640994
1988	65.18613043141748
1989	67.5684607127405
1990	69.71656879830384
1991	72.25028541463425
1992	75.4870722031499
1993	78.11638877338778
1994	79.58609676912405
1995	80.91669387115422
1996	81.44610587958327
1997	81.98990951678701
1998	82.14242092758943
1999	82.30092820873386
2000	82.90913169514506
2001	83.98636449717199
2002	84.72439414559088
2003	85.42097702947629
2004	86.41042434617493
2005	87.26411612452532
2006	88.10848872688251
2007	89.53044303350603
2008	90.95922996864623
2009	91.43852201009453
2010	92.68270128128921
2011	94.58501320104725
2012	96.0786938553442
2013	97.66169009223944
2014	99.07455885703372
2015	100
2016	100.73721928887855
2017	102.610533347787
2018	105.09255559364034
2019	107.09146370176119
2020	108.3836506915843
2021	112.93891770364898
2022	121.54680894552567
2023	127.44153553866342