Year	base year varies by country
1960	0.43986089344584733
1961	0.45481077103898093
1962	0.4704389806870717
1963	0.47289447782736693
1964	0.48247572345884937
1965	0.5106344508801186
1966	0.5362943250540528
1967	0.5482698412324423
1968	0.5445853489718709
1969	0.5628176867666335
1970	0.5924275322177144
1971	0.6170066058264523
1972	0.6453550345113684
1973	0.7240594516750046
1974	0.9268476976428113
1975	0.9873387496633891
1976	1.0887792067637214
1977	1.1873016896322879
1978	1.2907401542312922
1979	1.4497026075040313
1980	1.9816290440117794
1981	2.6371816396003163
1982	3.50588384780461
1983	4.243751105865495
1984	4.658339964545972
1985	5.072702517299218
1986	5.921243725566516
1987	6.987679910238562
1988	8.928530708956663
1989	10.332997943984894
1990	11.119295273508651
1991	12.354754552747346
1992	14.19902391276996
1993	15.522960133114724
1994	21.6812916089748
1995	32.31810572799414
1996	38.141494558477454
1997	39.88732839091229
1998	41.47705251897641
1999	45.137470683372975
2000	50.06482535575931
2001	51.82024149747577
2002	60.47047555731741
2003	56.223668560431726
2004	65.80580741075983
2005	80.77659940824547
2006	89.07555520693475
2007	100
2008	105.98774775648661
2009	116.79752494721905
2010	124.85532303943674
2011	135.0154581533807
2012	140.5866353501957
2013	147.56960507644027
2014	161.44993576495276
2015	166.30140154109102
2016	175.05614332217684
2017	192.2728397286829
2018	203.03748236146131
2019	222.60868220295933
2020	226.85654836751604
2021	261.22152767889236
2022	288.5154822730639
2023	310.297906931873