Year	base year varies by country
1960	7.660953529933949
1961	7.749866653301744
1962	7.834311722200795
1963	7.939586397539708
1964	8.059101075089922
1965	8.221228245293208
1966	8.531276951107106
1967	8.93336222276565
1968	9.394634665275449
1969	10.233140831771887
1970	10.862002709144408
1971	11.359759585914569
1972	12.130707720163313
1973	12.804086154019428
1974	14.498413355067369
1975	16.04341912584928
1976	16.42680314094736
1977	16.710773784023043
1978	17.086412558261557
1979	18.548000782908787
1980	20.404074296480506
1981	24.01321382326924
1982	24.90050388448633
1983	26.388798790377955
1984	27.22570251523697
1985	29.52919491758711
1986	30.90536968742815
1987	32.94090477824418
1988	33.42985013396483
1989	34.03599059418176
1990	35.76287840887237
1991	36.67717065989506
1992	38.109621560303275
1993	37.78493377823749
1994	38.609917393850715
1995	38.91973701471747
1996	39.302802051290456
1997	68.08403578186822
1998	70.15986446942861
1999	73.63343650877312
2000	74.31285769492648
2001	74.57529407545546
2002	77.52882945012352
2003	78.42419366246995
2004	79.36136088762686
2005	83.37387795926324
2006	84.06437583715046
2007	86.54256489669507
2008	87.83084676746437
2009	86.92058516196447
2010	86.57936487517902
2011	85.83598983992772
2012	88.7170719435415
2013	88.56594694801123
2014	91.79698446224303
2015	96.67042407968918
2016	98.2214911308714
2017	99.54582173075843
2018	99.99992073438011
2019	104.59332496556735
2020	101.8374968809186
2021	100.74596445458992
2022	105.07909488826887
2023	111.7457541523268