Year	base year varies by country
1960	1.5296239121821744
1961	1.5707402027887891
1962	1.663368181983104
1963	1.7227491796161751
1964	1.7433312031133967
1965	1.967962809941955
1966	2.267463399888967
1967	2.138951169584474
1968	2.375643788599593
1969	2.531577033932707
1970	2.7100109586817127
1971	2.7959772797437576
1972	3.1455494653755913
1973	3.0386855373951036
1974	3.671512145559536
1975	4.682013143893457
1976	4.707485277772589
1977	4.539671827446376
1978	4.965093867590244
1979	5.460528978155757
1980	5.87605047275547
1981	6.342453541465447
1982	6.935308657344103
1983	7.7875673148822395
1984	8.284254462364927
1985	9.230468152152433
1986	10.558969749595908
1987	11.89962121796795
1988	13.305598377028296
1989	14.803592260377762
1990	16.38992820556277
1991	18.445985401737403
1992	21.856481098184986
1993	24.21149710647672
1994	25.377519466199118
1995	26.97652183265871
1996	29.08690472881526
1997	31.20416756834189
1998	32.48598817682738
1999	35.373033352820876
2000	36.955068823826345
2001	41.02646355899628
2002	42.64079660068646
2003	43.949999096822786
2004	45.78114379194646
2005	48.58267071379439
2006	52.158374361129255
2007	56.12412627053175
2008	59.27822051970146
2009	68.7083955827331
2010	79.11560984844635
2011	100
2012	107.7411500296797
2013	115.372079668498
2014	124.64264875766315
2015	130.13819977064193
2016	139.44351674068506
2017	150.96352093167735
2018	157.5392782418339
2019	164.92969143976282
2020	170.23614317898426
2021	181.74872354010384
2022	196.7269847196001
2023	207.3820038298136