Year	base year varies by country
1960	5.593040792179568
1961	5.687301707185699
1962	5.836048807345512
1963	5.916928988364484
1964	5.950633936841388
1965	6.058511855343708
1966	5.986405506449484
1967	5.882999981888847
1968	5.965200996864144
1969	6.290450282952999
1970	6.569510142778616
1971	6.578878095065496
1972	7.018941623639718
1973	7.207687431127935
1974	8.65098427174106
1975	9.90177481950249
1976	11.442312673864866
1977	11.950582942915327
1978	13.32466309683557
1979	14.852948642184819
1980	16.031229273714036
1981	18.165133386052815
1982	21.37015313827947
1983	22.572673799277425
1984	23.072985223691678
1985	22.37382811084131
1986	22.11212096180247
1987	22.994428388597672
1988	22.649815150557863
1989	23.128391510709374
1990	23.44832233988474
1991	23.366794270579312
1992	24.065189162429686
1993	24.96215840195025
1994	34.70410973459477
1995	39.57114496950069
1996	41.31115666434546
1997	42.90368999541323
1998	45.6885786998714
1999	68.9380214021697
2000	70.7101199485181
2001	72.48020120532628
2002	74.12628110309974
2003	75.9044425815873
2004	75.32468207455354
2005	80.09321085061096
2006	81.82092954427007
2007	82.66980628054851
2008	87.80488318287011
2009	89.23212675679292
2010	89.81424054788788
2011	92.5464969772539
2012	99.31216919200634
2013	99.71953398162444
2014	100.10409976494448
2015	99.99993079917131
2016	99.62301312403292
2017	100.225750235477
2018	101.22564427351888
2019	99.60780269138941
2020	103.0031489867885
2021	104.52002710051518
2022	109.5882266276092
2023	113.95197578206029