Year	base year varies by country
1960	5.500156969919876
1961	5.68047664597181
1962	5.758919518394084
1963	4.5873936254084855
1964	6.126032658515509
1965	5.9386307515755865
1966	6.184159052869476
1967	6.569106541321433
1968	6.993528309826585
1969	7.34034611444425
1970	7.309502018518654
1971	7.784924134189184
1972	7.218417648421265
1973	9.727370279474398
1974	16.090088706740318
1975	16.793586836498157
1976	19.25635546191038
1977	21.14264642852291
1978	21.747130353310425
1979	25.87539159538053
1980	35.39264576216057
1981	39.088369439487316
1982	45.6957224875357
1983	47.03225022390039
1984	52.680925586819974
1985	52.008689703519096
1986	41.18577807831998
1987	41.59486950646007
1988	42.68263124821205
1989	45.981155572586985
1990	53.0430064583134
1991	47.014083958250275
1992	47.1146315498614
1993	46.87459155793919
1994	68.69539030240753
1995	69.61530091344349
1996	79.05699914027574
1997	79.80530276043739
1998	65.61081121038129
1999	78.20240236886103
2000	100.16894387136152
2001	100
2002	100.85580781423627
2003	100.6368292851927
2004	108.45155938758366
2005	130.24432859255901
2006	143.09701773450152
2007	149.1519700544413
2008	179.69674091069635
2009	147.21739039297432
2010	171.60295034852135
2011	193.36431134759414
2012	187.67572144424994
2013	176.11879139753512
2014	174.61933303241392
2015	159.0307640358438
2016	152.24054165940333
2017	158.05659033716788
2018	169.3997704729923
2019	172.02120684648108
2020	156.2401435053996
2021	195.84437519382973
2022	222.97952403588064
2023	206.44485154650002