Year	base year varies by country
1960	22.2520037946489
1961	23.15505446972777
1962	24.50431529103478
1963	25.692225745330344
1964	27.056670004420745
1965	28.084077084428532
1966	29.43351971051219
1967	30.744287224068838
1968	31.691551238740708
1969	32.5074158864983
1970	34.03941093056523
1971	37.154399538064155
1972	40.79625861048831
1973	44.1172474852913
1974	47.175728114097915
1975	50.54074506168791
1976	51.92043388520716
1977	52.054394719766975
1978	53.93499767756032
1979	55.00742425998906
1980	56.496300716949996
1981	59.6946171490989
1982	64.08100186049893
1983	65.59772500249805
1984	68.06396199109953
1985	69.60951128925895
1986	71.72187732559374
1987	73.29508385807266
1988	75.34019173340221
1989	77.9458022503001
1990	81.53413182297751
1991	85.9443984260095
1992	87.77040323262064
1993	89.80845305403511
1994	90.87213281923115
1995	91.5425489860064
1996	91.79888868417969
1997	91.3614822760958
1998	91.18857239432192
1999	91.22848614046795
2000	92.47584000724713
2001	93.37690916730887
2002	93.1439674884702
2003	94.24284205274547
2004	94.52239203105867
2005	95.39638226186841
2006	97.44765058846534
2007	99.76404100456558
2008	101.21054777906424
2009	101.67363054717029
2010	101.99160117626802
2011	101.97074091903238
2012	102.0357169434894
2013	101.94710643270865
2014	101.28126561349464
2015	100
2016	99.41670840841603
2017	99.05098494181178
2018	99.80802091941821
2019	99.70432521837954
2020	99.00720491711805
2021	100.24102475124539
2022	102.74420302755559
2023	103.79559886796483