Year	base year varies by country
1960	0.5044711727645064
1961	0.5014144562753351
1962	0.5295072866625509
1963	0.5589235747636481
1964	0.5706944906208289
1965	0.5847917618511712
1966	0.5641629686045333
1967	0.5716620402947392
1968	0.5937837013119704
1969	0.6131281823941047
1970	0.6396359249711355
1971	0.6782756080242213
1972	0.7233390812012872
1973	0.7644312793935251
1974	0.9032504323127762
1975	0.9972448616884162
1976	1.1166906800394634
1977	1.2231983266697282
1978	1.2909569158509282
1979	1.4711176186055932
1980	1.6067190139814682
1981	1.7105974019441705
1982	1.8590020579420485
1983	1.9799007362161225
1984	2.509371601345313
1985	3.3408030799864346
1986	3.485153397177427
1987	4.069030045963222
1988	5.444830571290737
1989	6.939380078745802
1990	10.7336826073948
1991	20.517968494492873
1992	21.783105503943798
1993	22.705586609535132
1994	24.73514698026673
1995	26.945983539350575
1996	28.102684479481923
1997	30.447307639293815
1998	31.809208618477314
1999	33.41055198185987
2000	36.31670611957933
2001	38.12098865312776
2002	41.088719257663335
2003	55.05889912035048
2004	79.5012644826281
2005	86.37803219447858
2006	92.56164639367832
2007	100
2008	112.72518778716778
2009	113.36004673141417
2010	120.56892117518476
2011	132.45892862941594
2012	138.7839436334565
2013	145.9710062515537
2014	152.17529070456766
2015	151.96060383476237
2016	153.2169598744196
2017	161.22069773396242
2018	169.14921758974126
2019	172.29971743264133
2020	189.21291998676583
2021	215.21749694173718
2022	240.33322423823665
2023	249.2916806357169