Year	base year varies by country
1960	16.538828992978885
1961	17.38018464681369
1962	17.960718133052886
1963	18.621361143142845
1964	19.21422584545524
1965	20.236694627945983
1966	20.868558316956054
1967	21.546319542457077
1968	22.157810975420205
1969	22.76351088634535
1970	23.84297877553938
1971	25.322286488661582
1972	27.246762940180965
1973	29.438912671967156
1974	32.236239225362574
1975	34.31798331058179
1976	36.24834222351063
1977	38.132789194048655
1978	40.41809358656449
1979	42.08104397704734
1980	44.42943099162917
1981	47.41360821559822
1982	49.952744158708626
1983	51.687494750437665
1984	54.245908620968144
1985	55.853212617390305
1986	57.50143925472195
1987	58.902719536493706
1988	59.80207891543115
1989	61.575067362658054
1990	63.42212271850295
1991	65.73187495021836
1992	68.01874820398957
1993	69.89408266255909
1994	71.65886814359112
1995	72.9587013895424
1996	73.67822411714708
1997	74.61172392820528
1998	74.94143703631212
1999	75.13354918119038
2000	76.15840153213506
2001	77.6412858765368
2002	78.53074108307999
2003	79.55757181310558
2004	80.94164988622498
2005	82.99578234805763
2006	84.56619623041598
2007	86.4445601727905
2008	88.13569436410462
2009	89.80081046563272
2010	90.58482089747892
2011	92.24561228382657
2012	94.14055456928604
2013	95.66929180371253
2014	97.75077550890346
2015	100
2016	101.84829469843848
2017	102.87241409245786
2018	104.76327536223529
2019	106.44773916428593
2020	109.34258028117196
2021	111.60401456883902
2022	117.51599587921923
2023	126.45540404067972