Year	base year varies by country
1961	2.1648371815069356
1962	2.217500381713052
1963	2.3162953352071116
1964	2.4213163429508207
1965	2.371305480257719
1966	2.4695505377558846
1967	2.5283644552319404
1968	2.528071531790313
1969	2.489167681272365
1970	2.492357764482773
1971	2.6486770994038893
1972	2.837321668410105
1973	3.30584055356652
1974	3.7251655711090277
1975	4.284103025264002
1976	4.542461897753364
1977	4.832568238786211
1978	4.952860487360743
1979	5.558838914060169
1980	5.922801057890706
1981	6.353098657535905
1982	6.993869510210317
1983	7.501330608117242
1984	8.31992131270221
1985	9.17229107738222
1986	9.838222493153701
1987	10.867509910699095
1988	11.4525291421344
1989	12.365997164484703
1990	12.692765863242824
1991	17.949234261784603
1992	18.97986899974743
1993	21.240918921222633
1994	23.597089386032497
1995	24.2676998122263
1996	24.718366405645263
1997	27.70361918421569
1998	32.81538378132417
1999	34.38216061379661
2000	36.565973374461386
2001	38.69653330594926
2002	41.29492466671657
2003	43.14720009598067
2004	47.86644256860371
2005	54.847887274215665
2006	62.57653754613054
2007	68.1430870479958
2008	75.44551634708547
2009	75.17472114215096
2010	91.97113592942372
2011	108.11001525941997
2012	108.602820893902
2013	113.47688105972735
2014	100
2015	95.20609142172958
2016	105.87881780850988
2017	107.55587299794418
2018	112.4544593170595
2019	118.44608334562612
2020	126.07504548407952
2021	135.4863876465891
2022	137.9738274426362
2023	141.6914906932448