Year	base year varies by country
1960	2.1752690786912123
1961	2.094782078403464
1962	2.142831809714729
1963	2.4152046932542004
1964	2.2370238542441303
1965	2.277730915639749
1966	2.3364428908789865
1967	2.37816764435798
1968	2.5462689996787407
1969	2.602495341181297
1970	2.6433450938160115
1971	2.808194733947658
1972	3.196700758635778
1973	3.69205034902556
1974	5.891670904824907
1975	6.201665944217216
1976	5.887457965696181
1977	6.392567088489427
1978	7.079883155260141
1979	8.349764033311786
1980	10.568260446861883
1981	11.716385637689523
1982	12.755071074000949
1983	13.831178599455779
1984	14.863492706269396
1985	16.08222844649318
1986	17.372435016909137
1987	19.61608453678042
1988	21.751581264371573
1989	24.154599840060623
1990	26.711033484921607
1991	28.998640917386552
1992	30.55163392713235
1993	33.368561164403594
1994	35.55601400413141
1995	37.47717707331094
1996	40.10134504493416
1997	42.15484238733643
1998	45.09032835704366
1999	48.053625212089194
2000	49.6922198796953
2001	52.78904524181433
2002	56.07214598603244
2003	59.22519074447834
2004	63.27942142236197
2005	65.77775606946673
2006	72.07129547499746
2007	78.05920592892646
2008	82.49819318946984
2009	81.95848931512126
2010	82.88168524551375
2011	85.50195971972363
2012	87.6100306744044
2013	91.23212011583935
2014	93.21030987053697
2015	94.51481681250253
2016	96.7686474175862
2017	98.35227182511038
2018	100.00005513484773
2019	99.53421200415771
2020	102.09526753569544
2021	105.31861968059056
2022	115.39331506370327
2023	123.10243675406471