Year	base year varies by country
1970	23.10131029054081
1971	24.62412555185336
1972	26.440282805368597
1973	28.3494983375152
1974	31.55411665193967
1975	33.33852157192594
1976	35.3963149348876
1977	37.239166579464126
1978	39.05598288669489
1979	40.83098993886049
1980	43.279697996473075
1981	46.15461570269192
1982	48.73359717433851
1983	50.34073383841323
1984	52.717391112950416
1985	54.56229399878886
1986	55.81600785885528
1987	56.82327698101126
1988	57.69906167330304
1989	59.46374455776784
1990	61.304949368106186
1991	63.46548255956268
1992	65.76344979167851
1993	67.73035400057914
1994	69.36539968473076
1995	70.72608546239721
1996	71.73725574949668
1997	72.6782179273627
1998	73.0271682420349
1999	73.45189698771762
2000	74.7399215492261
2001	76.24931721563978
2002	76.96166159743385
2003	78.08306239253234
2004	79.47164139338494
2005	81.7606938206063
2006	83.41986106203584
2007	85.42528557354397
2008	87.61539396862872
2009	88.65314908444388
2010	90.2905477992541
2011	92.82643446622905
2012	95.14256218807229
2013	96.78193624280638
2014	98.45447654650569
2015	100
2016	101.426881684849
2017	103.06219932183434
2018	105.14031951332406
2019	107.28184498272262
2020	109.717667873354
2021	112.47640868856683
2022	121.03314642869537
2023	128.7172242997455