Year	base year varies by country
1960	13.34107989648507
1961	15.376127389047983
1962	15.358450236752386
1963	14.955811469533026
1964	14.901665676546411
1965	15.031277503997826
1966	14.796478303059438
1967	14.916847251043652
1968	15.120249762550774
1969	14.54680994817351
1970	14.166473353832659
1971	14.260813198488778
1972	14.271392670636967
1973	14.301143532126343
1974	14.340862909056549
1975	14.178642631019112
1976	14.163572686602718
1977	14.318489847075488
1978	14.558344955629702
1979	15.082453347862456
1980	15.64831337214997
1981	16.01728048104672
1982	15.994799412674837
1983	16.17982649447793
1984	16.97978344300555
1985	18.713317291531787
1986	19.587045967743748
1987	20.582560804581394
1988	23.074627594616928
1989	25.05961438817983
1990	26.490825141696668
1991	28.269561386442867
1992	30.584929780791136
1993	35.2295157774597
1994	42.49278110379136
1995	48.29971556143573
1996	51.44244795069615
1997	52.2740504844179
1998	51.80345249341688
1999	51.149144356114896
2000	52.20424512774587
2001	53.27289184431382
2002	53.593647435065606
2003	54.98878532390592
2004	58.811601654920246
2005	61.10745618407826
2006	63.50687063605043
2007	68.42845401188417
2008	73.76268878986757
2009	73.60813134874894
2010	78.67338676423473
2011	85.02680123884909
2012	87.00896097347986
2013	88.89128675568367
2014	89.80781253504323
2015	89.80516850893761
2016	91.06903798027663
2017	94.92370073587733
2018	98.24579070807353
2019	99.50991969762538
2020	100
2021	104.55232657897571
2022	106.41931919158665
2023	105.84936954820638