Year	base year varies by country
1970	28.454254359476845
1971	28.634424681693073
1972	28.284144145659607
1973	30.741124981751426
1974	31.775169169810592
1975	33.47934888606214
1976	35.16225728326744
1977	36.89242527739619
1978	38.425298921238735
1979	40.81015822165715
1980	45.86758487120145
1981	49.43623869131959
1982	51.137681499923424
1983	50.98146399728499
1984	50.89140648655345
1985	51.21533720180052
1986	53.016942139854926
1987	54.63473817017434
1988	55.650704627831935
1989	56.845546614244604
1990	58.63677811871509
1991	60.60162259771559
1992	62.75565783667384
1993	64.54702180376
1994	66.84602152486214
1995	72.86123943098899
1996	73.65201864332124
1997	74.35483233824776
1998	75.26078254776269
1999	75.8369977415993
2000	68.72337144350212
2001	71.75855623858486
2002	73.71450976480746
2003	75.09413925606228
2004	76.68100833115302
2005	78.16668713450986
2006	79.8551846836484
2007	81.67907749703596
2008	84.31738394927868
2009	86.02131577907511
2010	88.74448800972162
2011	89.7418887556232
2012	91.66783672476888
2013	93.75435372274778
2014	95.9507643157937
2015	100
2016	101.99701751671788
2017	104.17647383203897
2018	105.9816414458816
2019	108.43280936835245
2020	110.2587426651476
2021	112.46971132273262
2022	118.38736378766647
2023	124.63064247002768