Year	base year varies by country
1977	26.626421880806035
1978	29.999863632618144
1979	35.38747020234263
1980	41.30067192248805
1981	42.02672230067689
1982	44.00822877575904
1983	47.29101148660533
1984	50.212606936187655
1985	54.19657990597716
1986	57.25406855554236
1987	60.51404081639823
1988	63.23648240250487
1989	68.55303384729444
1990	70.7524587604725
1991	76.1655370712672
1992	79.50682518714223
1993	81.63737792938684
1994	87.87408747891816
1995	88.56296225490782
1996	91.4544969927339
1997	92.77589394059676
1998	95.13250642041419
1999	97.54543771575428
2000	95.8064653429526
2001	97.80340296854703
2002	98.57662553965505
2003	95.50175149392129
2004	99.12318413133242
2005	97.68765457850354
2006	100
2007	101.52504863379201
2008	103.05643024941271
2009	111.3049781688835
2010	111.63552027864296
2011	113.51693812988277
2012	111.2902541833818
2013	115.2594064834487
2014	114.91613304219108
2015	122.75322229415573
2016	127.29251210891479
2017	123.38041249759056
2018	126.74242488344348
2019	132.4246507226152
2020	130.92332400488542
2021	134.88501817396624
2022	139.69102033164614
2023	143.69486670355784