Year	base year varies by country
1980	30.39637468824975
1981	32.63233183182649
1982	30.13882809478815
1983	30.8593444438517
1984	36.718461692859364
1985	38.352752120926596
1986	40.07230318299814
1987	42.59168742900469
1988	42.778193295932084
1989	44.46404911368059
1990	48.191122236006734
1991	50.83311393593654
1992	51.720245193747026
1993	52.23969720300637
1994	53.58680960264505
1995	56.30105870587917
1996	56.56115205878876
1997	58.18655089539636
1998	59.60062249315416
1999	60.99082623480816
2000	61.67138264153864
2001	61.10885284458287
2002	61.36044438092362
2003	64.56623141535138
2004	65.02344738739514
2005	69.50807327429546
2006	73.10554250372059
2007	75.73068949078339
2008	77.64877634398252
2009	77.89603841470387
2010	82.12019992285407
2011	83.28006969833444
2012	84.95680456131232
2013	90.05906698276208
2014	93.46360345847788
2015	96.48850887164532
2016	96.4338142532743
2017	99.76906507409701
2018	100
2019	102.17847636403022
2020	96.89927674020103
2021	105.76413874543258
2022	114.41788813763718
2023	119.21786167047668