Year	base year varies by country
1961	3.5763711175294333
1962	3.5641164780625822
1963	3.5612410330939626
1964	3.742740040038978
1965	3.8521460859073398
1966	3.8649914605631226
1967	3.933515613549222
1968	4.0197674772306655
1969	4.190247928790937
1970	4.453369404680594
1971	4.414642475159286
1972	4.2655408585616446
1973	4.281880595931811
1974	4.5984399817187755
1975	4.5416817807128
1976	4.89831694017617
1977	5.4512528381074254
1978	5.646764570411119
1979	6.251709852086041
1980	6.254776651657499
1981	6.415266595380666
1982	6.689232576769129
1983	6.8700343938446835
1984	6.682209031309013
1985	8.806333813454483
1986	8.341962141510598
1987	7.831476436026239
1988	8.074683227543886
1989	8.525632637691585
1990	8.804538018998462
1991	10.484821608008343
1992	12.11334778206002
1993	13.73373386852989
1994	14.136280830633066
1995	15.932488838498848
1996	15.970589479828412
1997	16.00359358950252
1998	15.97956468381508
1999	16.334746158142337
2000	17.44550888932581
2001	16.441461350909815
2002	15.846044644425373
2003	17.869264190408895
2004	18.568195881155244
2005	20.401900277092853
2006	22.758799163867216
2007	26.677996262700937
2008	34.764543274524776
2009	43.15893426759233
2010	43.78239628450974
2011	52.56596593499546
2012	70.19732947087437
2013	73.63838803004249
2014	81.72519990431007
2015	90.58138615314301
2016	99.99997123903239
2017	106.67682440189768
2018	119.88586329583364
2019	135.30366104507482
2020	160.0027900130535
2021	194.824619719042
2022	262.36515840092727
2023	348.99995158506886