Year	base year varies by country
1980	29.61747045651212
1981	33.932001170200586
1982	36.14766103721417
1983	41.64480438006159
1984	44.20998427802155
1985	47.336229105185076
1986	50.83545395276452
1987	52.47399268536193
1988	53.490574592203764
1989	56.678963333732234
1990	57.91224786857975
1991	62.614088339962315
1992	58.37853998196556
1993	60.03230110245067
1994	65.68549443272069
1995	71.1511676715256
1996	73.42708031313424
1997	74.10581568190264
1998	75.10376488825497
1999	79.46831535702876
2000	75.92400901175182
2001	82.47623883344176
2002	85.9160389683392
2003	90.30792011542258
2004	93.36787912202537
2005	93.66281112684884
2006	96.57643986448335
2007	100
2008	103.14428979865365
2009	104.16133489966542
2010	105.90619607405006
2011	109.13176922796572
2012	113.79222241048052
2013	115.78604084133445
2014	116.75290622623275
2015	116.14245207067377
2016	118.13427980242852
2017	118.60976335019411
2018	120.78704474950098
2019	125.87109945873296
2020	126.71401842937426
2021	126.78951134367121
2022	133.3351934344193
2023	137.61964289616463