Year	base year varies by country
1960	16.16632710322915
1961	16.252805397622634
1962	16.345709469518837
1963	16.691659466157667
1964	17.163079540206216
1965	17.26950046453308
1966	17.490141139342914
1967	17.942903674198778
1968	18.044122781949714
1969	18.262130490887333
1970	18.887140545516516
1971	19.43549836422611
1972	20.40688864183798
1973	22.150091146454358
1974	24.722022346212547
1975	27.04164878134727
1976	28.267855557243866
1977	29.584231738090374
1978	31.92770417970476
1979	34.87949001802765
1980	38.416446339323265
1981	39.815636937397166
1982	41.755329330484464
1983	44.88570835175888
1984	45.61701469897247
1985	45.986314184289775
1986	46.14195458241324
1987	47.19828357220728
1988	47.10769629918271
1989	46.5063391412068
1990	46.7691954698609
1991	46.99967234909357
1992	49.37835373587187
1993	51.13360841210215
1994	53.01519502067713
1995	53.26262070089087
1996	52.76068240233973
1997	53.60951685467771
1998	54.14428202616762
1999	54.60038639255406
2000	53.91887427277248
2001	54.47327573019351
2002	55.38370711377774
2003	56.0102985795566
2004	57.11090348879292
2005	58.109385607573415
2006	59.254131643160065
2007	62.11310805368328
2008	66.78866918784477
2009	71.11053733102285
2010	72.9524097200633
2011	77.21582071456314
2012	81.98464665394357
2013	86.49722131145442
2014	90.12827893194998
2015	92.3623506847467
2016	94.21154534434297
2017	95.84060197020065
2018	100
2019	100.31525086650723
2020	99.76254517109159
2021	101.69326253697484
2022	104.18414103772322
2023	105.78380076259914