Year	base year varies by country
1960	7.164518957158256
1961	7.407672025838371
1962	7.345240719707578
1963	7.401174426948266
1964	7.347959855261799
1965	7.9414411902517665
1966	8.335168722746785
1967	7.900150007745187
1968	7.629979554235415
1969	8.274187302913512
1970	8.864686578099997
1971	8.91785988555604
1972	9.217604973760425
1973	12.520964548547866
1974	13.478475135243153
1975	12.616822842570688
1976	14.183372245611203
1977	16.416940629883726
1978	18.257501549710554
1979	19.094885498267676
1980	23.122917524391227
1981	25.782051040202447
1982	28.36026088713364
1983	30.57235687196455
1984	34.154670766738555
1985	32.13948361644348
1986	30.78953573720326
1987	31.308204995569604
1988	29.648870829060936
1989	30.063950975213004
1990	41.897108332861634
1991	40.790713260682296
1992	38.66880599810607
1993	37.17278200997955
1994	45.430480431649976
1995	47.361031125762636
1996	50.66144849080255
1997	54.20353552317309
1998	57.49811459368498
1999	57.71646175028782
2000	59.55091813485169
2001	62.53592037191878
2002	64.1445330556273
2003	64.02363255393678
2004	64.27136689632084
2005	69.78898947330832
2006	70.83317064573556
2007	75.8174607924564
2008	83.49709913256238
2009	86.99567768276613
2010	90.01881490289514
2011	93.59400682085905
2012	98.56229433456566
2013	98.19842788912044
2014	97.80005960462252
2015	100
2016	101.79272146557585
2017	102.16760037051893
2018	104.62338892575234
2019	104.59787885305954
2020	105.8143309944492
2021	109.11430536564659
2022	113.49960927586613
2023	117.34488288117231