Year	base year varies by country
1960	15.231796306694928
1961	15.432165818685556
1962	15.689526805209786
1963	16.164259989572034
1964	16.914673888310794
1965	17.777442847576896
1966	18.50383181704749
1967	19.094738906846885
1968	19.59507630281824
1969	20.383548138781755
1970	21.31022413571847
1971	22.45207236147256
1972	23.870553703097926
1973	25.49541905459994
1974	28.597788396343155
1975	32.2839640495682
1976	34.72955927008552
1977	37.32665653901333
1978	38.97770800030317
1979	40.733747828013975
1980	42.414665431292256
1981	44.594438501048906
1982	47.970423119320415
1983	50.66293118899272
1984	53.41834476324917
1985	55.89040801407085
1986	57.453540402117795
1987	58.42112172660586
1988	59.68826995813927
1989	62.55178925929808
1990	64.31099810311902
1991	66.1609840181352
1992	68.42668316465658
1993	71.15911932048502
1994	72.64940815474183
1995	73.53629002956976
1996	73.88677850458365
1997	74.4465627743766
1998	75.79080229681932
1999	76.24471173134258
2000	77.78075095065687
2001	79.32298979680333
2002	80.62389301285499
2003	82.1155065328796
2004	83.68801105014434
2005	85.43129442749651
2006	87.36606305589306
2007	89.05373174479475
2008	90.75362982938758
2009	91.23750948654924
2010	92.96379420380605
2011	94.64392836150029
2012	96.50000874604243
2013	97.72677297678615
2014	98.6870807670005
2015	100
2016	101.92085069495049
2017	103.78628029868429
2018	105.39479278922637
2019	107.25827539746578
2020	108.97386175977087
2021	112.43050562626982
2022	119.05457707562184
2023	123.91185393844195