Year	base year varies by country
1960	2.9775213108669525
1961	3.1022513182390776
1962	3.1929603652045073
1963	3.2610663824604647
1964	3.446442132771664
1965	3.518028248670587
1966	3.609696296024633
1967	3.7043107663915804
1968	3.7579744204128427
1969	3.855875978921625
1970	4.027291848376394
1971	3.9154322028010267
1972	4.066745013552441
1973	4.28414527233651
1974	4.917296678766085
1975	5.231256282496198
1976	5.677596962219322
1977	6.3702342521408575
1978	11.152615675471921
1979	12.084400455837033
1980	13.449025910283579
1981	13.87526969181219
1982	14.949222311108118
1983	15.544921631340783
1984	16.052294771028876
1985	16.319001000224244
1986	16.66637996894808
1987	17.04012398626491
1988	18.603983147099775
1989	20.744128167392166
1990	25.931962352341504
1991	32.74783402867937
1992	33.95104639292969
1993	37.65463511129768
1994	45.68968264266446
1995	56.52451967633535
1996	66.80835216485168
1997	78.03990853051627
1998	86.07723474029605
1999	92.59821129680564
2000	100
2001	108.08434938014908
2002	113.63117325493218
2003	120.17603426441323
2004	127.92977258865557
2005	137.24199074285005
2006	144.58260296064643
2007	154.16193368389855
2008	166.17194015409177
2009	178.8902958159748
2010	187.25528349886565
2011	201.8746877980794
2012	209.1013724884295
2013	211.97448916115863
2014	226.49337808938284
2015	242.19564389436096
2016	251.10376471922584
2017	262.43568332871314
2018	267.54587534630036
2019	276.5320480467898
2020	285.9396193295055
2021	299.1092206942237
2022	326.9634528965062
2023	347.16517671266087