Year	base year varies by country
1960	3.2176097325596333
1961	3.264487181749782
1962	3.2840421327174694
1963	3.2839612481652507
1964	3.4277851067556173
1965	3.511793958902951
1966	3.2493131509465383
1967	3.315574641814761
1968	3.428240196412507
1969	3.508859506742476
1970	3.6108051943623996
1971	3.66765480688475
1972	4.684006622999259
1973	5.27175924013553
1974	6.375368674688681
1975	7.236504796162654
1976	7.897499481458195
1977	11.357018690543647
1978	11.305317059310118
1979	13.228347913682112
1980	17.33388759101282
1981	18.607347955491075
1982	18.928533907198876
1983	19.531787157534023
1984	20.143765939875756
1985	20.6029251954085
1986	21.78690891119379
1987	22.587321461311216
1988	23.474721425869518
1989	23.973739045082095
1990	25.50090877944944
1991	24.97988525542803
1992	26.146010062787234
1993	26.937793002858818
1994	27.653269834243382
1995	27.0800368018563
1996	25.43349821845856
1997	25.655953736989762
1998	28.327196132022102
1999	28.90978308972111
2000	29.271717717346124
2001	31.073907589179694
2002	32.1966580094527
2003	34.11134006895833
2004	42.52801303494556
2005	42.72306568734382
2006	43.33927945317963
2007	48.14100971131076
2008	63.510660609367456
2009	81.4092118525371
2010	79.68357228463196
2011	80.53170939193069
2012	88.93703251182068
2013	93.95328705106148
2014	100
2015	98.99681358128642
2016	96.72526391164567
2017	98.98137149148806
2018	102.3936374418642
2019	102.52362640891772
2020	107.88605147138117
2021	110.8529825516109
2022	112.5405983165096
2023	111.49114655354926