Year	base year varies by country
1960	6.828500887418712
1961	7.009294000374447
1962	7.343386553598598
1963	7.5925255163677345
1964	7.951054647791772
1965	8.33068847437796
1966	8.66200676266718
1967	8.918833134572555
1968	9.31339132914886
1969	9.704138166240849
1970	10.953504151991988
1971	11.65267889195534
1972	12.295614253889887
1973	13.363434866008753
1974	14.88313032772202
1975	16.205519433062847
1976	17.47612525630207
1977	18.90387825165989
1978	20.087354587474838
1979	21.23285617335585
1980	24.019987034539593
1981	27.113556443957158
1982	29.963183800872383
1983	32.04926807781511
1984	34.039547453045635
1985	35.808896798285964
1986	35.61166158419974
1987	38.183270363540785
1988	40.04220783136162
1989	42.28948384505624
1990	43.901378056248674
1991	44.87238902689889
1992	44.585313533796246
1993	45.60761924667007
1994	45.53647238782753
1995	46.93055759937084
1996	48.93050125519091
1997	50.293563460294465
1998	49.945234124119395
1999	53.253118436461264
2000	61.418584150751734
2001	62.47046354785124
2002	61.52078336544127
2003	63.28078426177386
2004	66.98284038652584
2005	72.85254946366632
2006	79.21417122219066
2007	81.65211567176055
2008	90.27979096931816
2009	85.66112741244417
2010	90.76255707603484
2011	96.81895191008635
2012	100.06537782782587
2013	102.62028599730293
2014	102.88538790571751
2015	100
2016	98.40190283647561
2017	102.41763464203788
2018	109.32361195933187
2019	108.72400757000761
2020	105.98714097499933
2021	127.41082573197569
2022	163.29203871963622
2023	145.96262137607843