Year	base year varies by country
1960	14.080377570518355
1961	14.328618406768262
1962	14.523052684489201
1963	14.659229437523333
1964	14.972375647088715
1965	15.81241789169101
1966	16.725416429407314
1967	17.24765814279718
1968	17.537308090452804
1969	17.575176791458823
1970	18.870404471685607
1971	19.825983573574515
1972	19.581086055889415
1973	22.454859285734805
1974	27.32994912180328
1975	31.942504263750603
1976	32.312233784970026
1977	33.03683415693944
1978	35.46477122109199
1979	36.7363372620321
1980	42.22797284728216
1981	41.36466314862313
1982	38.4774119846451
1983	41.455854247529274
1984	45.36890545945742
1985	44.54998015268157
1986	46.42213124322069
1987	50.87008495453469
1988	52.7656750096878
1989	53.84493674723602
1990	72.7093864956933
1991	70.92307094092853
1992	73.34148129904467
1993	74.71822224324889
1994	76.6892001543457
1995	80.76577982016374
1996	82.98558872025174
1997	81.74075329815012
1998	83.70908090387744
1999	82.30920288162095
2000	83.47313540639725
2001	81.84114506195169
2002	82.43032705816499
2003	79.00366203215191
2004	80.65708497681507
2005	83.08664014702794
2006	85.78475060905947
2007	89.07552939568262
2008	92.20881574460975
2009	89.92821403200287
2010	91.869464084256
2011	96.37037257483057
2012	97.08968722530467
2013	98.94754980637974
2014	100.00116337459406
2015	100.0484783668157
2016	102.15143847184918
2017	105.24860165450609
2018	105.34948761735609
2019	105.21183598100399
2020	104.63353131697717
2021	105.11358603989898
2022	112.85502743647609
2023	125.15255530129672