Year	base year varies by country
1960	0.8821632120970724
1961	0.9047115292875898
1962	0.8621080905701789
1963	0.937565733139395
1964	0.9601228858517786
1965	0.9956016199440403
1966	0.9473198470525416
1967	1.014655657345529
1968	1.0817182711088658
1969	1.108813374269097
1970	1.2592850175707013
1971	1.3006275928941133
1972	1.4209136721419837
1973	1.6187233016283622
1974	1.8891683984037333
1975	2.1125480548382773
1976	2.2564780311796184
1977	2.499360741938048
1978	2.7138249389545153
1979	3.1498762220152665
1980	3.7401147176644223
1981	3.8916267014439385
1982	4.537829506466496
1983	5.049032617507298
1984	5.783780519164037
1985	5.9322071824910925
1986	6.44261305117135
1987	6.853701285580806
1988	7.740410058197207
1989	8.509940960332747
1990	11.396774667634114
1991	12.369531067175105
1992	13.694542149782073
1993	14.998397343396894
1994	16.433521663739597
1995	18.633445992827284
1996	20.328646866938644
1997	22.21374963003614
1998	23.323675302617968
1999	24.260164799944057
2000	26.53176192038279
2001	29.21698629686706
2002	31.597513809226953
2003	33.03091094576282
2004	37.05814632595458
2005	41.80827019129047
2006	46.96488958281257
2007	54.17718757266595
2008	64.61981723567214
2009	64.66367338320195
2015	100
2016	104.6209187444105
2017	110.36869576396604
2018	115.72314817167593
2019	120.4006272950648
2020	123.26179839701017
2021	135.81970109699643
2022	205.07791747393534
2023	239.20407028936478