Year	base year varies by country
1977	19.762927981109797
1978	21.507293061638133
1979	24.771026237797834
1980	27.678529962691766
1981	30.070905064753994
1982	33.53107977016641
1983	35.34681794359694
1984	36.831650069752044
1985	39.72324580001314
1986	43.031919737314325
1987	47.045318677564715
1988	53.03363812161292
1989	55.74886020822465
1990	56.91870015369507
1991	58.686900903385975
1992	60.407151135046696
1993	61.80609234430203
1994	64.02446195460426
1995	65.97488318220402
1996	68.22621514922625
1997	69.9527617945579
1998	71.82855679965508
1999	73.2729192042225
2000	74.36340504137944
2001	75.91372079089275
2002	76.89504581220326
2003	76.5234550183873
2004	78.32162099514358
2005	81.9845483990867
2006	82.90611175758376
2007	86.53204675136617
2008	90.63139133676862
2009	91.63814755518999
2010	93.10941110845485
2011	93.73198300713094
2012	93.9126446421785
2013	94.36049286360293
2014	96.03859250851305
2015	98.716312092808
2016	98.25412102676346
2017	98.56072743224429
2018	100
2019	100.71845231145761
2020	101.5242699815563
2021	106.51292953728588
2022	113.43505165770276
2023	118.88614558291641