Year	base year varies by country
1960	6.982798292462988
1961	6.647388812958704
1962	8.10553021176987
1963	9.790951306635268
1964	10.553944078102719
1965	10.636520419527354
1966	10.29080016654824
1967	9.568734454197726
1968	10.22540297546439
1969	11.059352339180045
1970	12.029456198073982
1971	12.579609992162691
1972	13.765831386064594
1973	13.225773357590512
1974	13.314575761120015
1975	16.57831589365025
1976	20.458291251853503
1977	23.991245647161833
1978	26.787904128041752
1979	29.703958628878745
1980	30.857101627031152
1981	35.5492831638518
1982	32.30289163505522
1983	34.866956644552
1984	39.21040989071009
1985	47.55245005305815
1986	46.99926448020873
1987	52.23336786619777
1988	54.95975393334269
1989	58.600387036380084
1990	44.38451023161671
1991	46.17434343217079
1992	45.446592487720835
1993	44.23098384061349
1994	55.232199252975136
1995	61.91245206729663
1996	73.32335996170404
1997	75.66822878230104
1998	81.13323593791877
1999	71.88468781157613
2000	76.11237609703065
2001	79.67272484760515
2002	74.59172911740671
2003	65.00151250550068
2004	81.17144483352098
2005	100
2006	113.34865036083579
2007	128.53971403326142
2008	127.4542599473775
2009	136.33359431656794
2010	121.23754960425677
2011	144.48116797771408
2012	156.0828403519325
2013	156.1324594342571
2014	156.2814343365183
2015	156.7613621809497
2016	159.8975937140326
2017	170.85806504185902
2018	178.35300024661248
2019	183.9939895446611
2020	199.2058293113902
2021	202.7657721111237
2022	203.5438235353474
2023	211.7845587993354