Year	base year varies by country
1960	0.4317399066719815
1961	0.4467287085822673
1962	0.4572325471240817
1963	0.45974427133094603
1964	0.467537777211686
1965	0.4745570689336321
1966	0.48318363634323364
1967	0.48952320384785464
1968	0.5049042985073782
1969	0.5146039369488062
1970	0.5400276651800012
1971	0.6326530150785753
1972	0.6035101005675312
1973	0.661613709290441
1974	0.9851202549076544
1975	1.0433804845917902
1976	1.1564891134878712
1977	1.2944247198538645
1978	1.4249690200196483
1979	1.6242913769348444
1980	2.0443662424636027
1981	2.3378145625075577
1982	2.383163353973713
1983	2.545332755860264
1984	2.7599935353977463
1985	2.897234942646718
1986	2.966923387861378
1987	3.2292593597307615
1988	3.521861370893775
1989	4.085759749693713
1990	5.322094247158615
1991	8.18477445549051
1992	9.979377476221238
1993	11.339010241961388
1994	14.636127650100269
1995	18.818699341714716
1996	23.339309244118382
1997	24.973519053090076
1998	24.191576020670848
1999	26.8178948722175
2000	32.899659535868516
2001	35.536357663783775
2002	36.02422066144583
2003	39.24567299116268
2004	43.73793043724147
2005	49.14463553379797
2006	54.443008993481065
2007	58.3060212919467
2008	67.1206568859032
2009	62.17134867315571
2010	71.8432944819162
2011	83.99106762376903
2012	90.7124079075281
2013	91.52224564469422
2014	92.84965195205298
2015	88.21947676612207
2016	88.97524263511293
2017	93.3688466067864
2018	99.12473569290317
2019	100
2020	95.2886160837755
2021	110.49086474586045
2022	135.77788718578236
2023	132.71167724841112