Year	base year varies by country
1960	6.393388789145692
1961	6.025703273262584
1962	6.2024680224568325
1963	6.329029227004519
1964	6.581046137265524
1965	6.576362061794757
1966	6.510830925252148
1967	6.512679091329524
1968	6.592422531449109
1969	6.8136173665998845
1970	6.723809244827854
1971	6.7753051455869935
1972	7.011761916007324
1973	7.541346141902956
1974	9.059307786102677
1975	11.130805529499614
1976	10.919512367236818
1977	12.123958842256782
1978	12.32703975958506
1979	13.548845540754753
1980	14.833211642970085
1981	15.011718560430582
1982	15.7026497970295
1983	15.254833261808967
1984	16.05832871169747
1985	16.248686613717968
1986	16.325525440565208
1987	19.075896004851618
1988	20.784705587925465
1989	21.46438404253168
1990	21.428466894264286
1991	22.61659967268698
1992	22.376135825592357
1993	23.959493901368585
1994	25.23997573501115
1995	26.88327191880433
1996	28.35259181716549
1997	25.514830793035635
1998	23.81383308621062
1999	24.03238491129544
2000	36.96475385343814
2001	37.2309095942698
2002	36.71238421193224
2003	42.407022602943044
2004	49.55611641809053
2005	49.79894659223027
2006	54.348021416325956
2007	60.87937485705762
2008	71.42754571435347
2009	69.48268568501047
2010	74.007400740074
2011	82.09155872151605
2012	88.49236657313033
2013	92.66505433108912
2014	93.42298157292096
2015	93.48157032492384
2016	100
2017	97.38206584700613
2018	97.17768738125898
2019	96.6330777388255
2020	95.29896084157637
2021	100.40152957987996
2022	109.10253489031356
2023	112.8125