Year	base year varies by country
1960	0.6131407155966253
1961	0.6437338578662399
1962	0.6789957528426916
1963	0.6927442786280441
1964	0.6478790514045787
1965	0.7029327106043524
1966	0.7424440435457457
1967	0.8663776639029307
1968	0.8738723223195559
1969	0.9487117916400094
1970	0.9263217986999217
1971	0.9226820534571295
1972	0.9047146053442336
1973	1.6576929225942032
1974	2.664374187120481
1975	4.801860145841981
1976	4.12818057902289
1977	4.125102816980456
1978	5.136458552931465
1979	5.777328699445935
1980	6.737930259344801
1981	7.231299282897304
1982	8.287710031632892
1983	9.25491194904293
1984	10.23181347998196
1985	11.359978586804008
1986	12.345055550156179
1987	13.794118014150833
1988	14.766600363911614
1989	16.046463311429044
1990	16.821308039837568
1991	18.171764128942968
1992	19.059520878790224
1993	19.47891050285465
1994	20.08151968689871
1995	21.78044627456096
1996	26.243495705422117
1997	27.966586529203358
1998	29.553883543478243
1999	30.78735053314261
2000	31.77568623505516
2001	32.7739513631891
2002	34.40629909808024
2003	36.65382004739633
2004	37.57133336224687
2005	39.28612599783969
2006	41.15541253335046
2007	44.09023260835275
2008	48.61080823758581
2009	52.01460557908856
2010	55.436608982509505
2011	60.10519086612038
2012	65.64739054934404
2013	70.43114376654187
2014	74.71199829202483
2015	79.44042569209948
2016	100
2017	105.63474522577508
2018	110.62177031427818
2019	116.72737674307496
2020	120.20404260762221
2021	125.67941541440051
2022	131.49845846509285
2023	142.95210016323014