Year	base year varies by country
1961	0.7748921090549655
1962	0.7567084331329706
1963	0.7817628220504025
1964	0.7942609460142466
1965	0.803534313567309
1966	0.7890422156624208
1967	0.8035517201153329
1968	0.9007684087644182
1969	0.9124647532490741
1970	1.0266001367858257
1971	1.0419832542155665
1972	1.1354164340934325
1973	1.2801660710778577
1974	1.5922544627528032
1975	1.6774447683970655
1976	1.8447794983494734
1977	2.115797596979831
1978	2.3467979624929423
1979	2.7081413928468665
1980	3.249160664743562
1981	3.927757660347923
1982	4.403057985642557
1983	5.147475526076044
1984	6.192439613083233
1985	6.228597612252309
1986	6.597161480283736
1987	7.108539897875904
1988	7.8277132986057305
1989	8.682746731821776
1990	10.424790111226525
1991	11.532322227482108
1992	12.616787918082295
1993	13.863880985241227
1994	15.218463236258478
1995	16.634303775730682
1996	18.43371223382527
1997	20.078823134428404
1998	21.928918049447198
1999	22.84175337521428
2000	24.504046035681586
2001	27.852474958170493
2002	30.111748032801124
2003	32.74612381243014
2004	35.62827143115426
2005	39.34028367790297
2006	43.77669905289574
2007	49.917888250077105
2008	58.067989863922975
2009	61.48231951692834
2010	78.0425061490424
2011	81.14854275122754
2012	89.63947765673369
2013	95.24453134152614
2014	97.07382525138917
2015	100
2016	105.44322171526078
2017	111.21396611348875
2018	115.99094649747217
2019	120.48040810881298
2020	124.22049057008229
2021	134.1843278270567
2022	197.87316899327254
2023	232.53894885393854