Year	base year varies by country
1966	0.1850506524300074
1967	0.1929000960486098
1968	0.1981755513331988
1969	0.20631196692388093
1970	0.2170936772750376
1971	0.2321218462958984
1972	0.22073438280382837
1973	0.27911540732118273
1974	0.365881666314586
1975	0.4417754099057359
1976	0.4909500055330836
1977	0.5522524609804167
1978	0.6990141274013209
1979	0.8090175862738934
1980	0.9569708097035039
1981	1.0366323411501908
1982	1.1228261270890425
1983	1.3132641394101157
1984	1.7849780559893318
1985	2.294211703676913
1986	2.910462712488401
1987	3.2254502921345325
1988	3.6142969245813674
1989	4.061357308955464
1990	5.081452724557171
1991	7.309277844299798
1992	11.697456439818586
1993	17.87446203824697
1994	23.43471501018953
1995	29.337182090843932
1996	34.873726728878374
1997	38.22463823015869
1998	42.26692141608164
1999	45.190127404753774
2000	49.97444245877112
2001	53.87613178759345
2002	58.7701579385806
2003	65.60163348609532
2004	74.03708482396232
2005	82.52820844991096
2006	89.83046355742658
2007	100
2008	113.54680952548999
2009	126.78239903269417
2010	139.22005052969223
2011	147.28950704927607
2012	156.96923148591654
2013	170.17947264536477
2014	181.97281801809459
2015	194.083851185896
2016	203.1361389051026
2017	216.4412052932026
2018	227.2486366209498
2019	234.48083151397987
2020	242.6036978253365
2021	260.61935312289893
2022	293.9728976909977
2023	328.328196753235