Year	base year varies by country
1960	4.237789612621856
1961	4.344748121044311
1962	4.5567824164287005
1963	4.678513893013536
1964	5.130504107546535
1965	5.359011202331179
1966	5.5970686031026045
1967	5.77851942619893
1968	6.023333869602876
1969	6.572143354879195
1970	7.211533810778305
1971	7.971571434876984
1972	9.038575680514617
1973	10.41899969442912
1974	11.053268186656148
1975	13.27866086888307
1976	16.070223738570157
1977	18.202517242851197
1978	20.118595536252943
1979	22.870026930747756
1980	26.233017717867625
1981	30.808724839822798
1982	35.48615243464811
1983	39.286322163280616
1984	41.79250339244626
1985	43.96000019278509
1986	46.83924670308392
1987	47.868496297113815
1988	49.42245720763518
1989	52.151449597126565
1990	51.771169445492085
1991	52.70377254485623
1992	54.185919564821624
1993	56.990448460309985
1994	57.9561691967482
1995	59.71455741149191
1996	61.08336577449898
1997	63.483490029492074
1998	67.6434240113845
1999	70.60363106195766
2000	75.45759559753623
2001	80.63374976465703
2002	84.81614456407281
2003	88.13392320769758
2004	88.58810969293178
2005	91.31060937915402
2006	94.43333879166941
2007	95.56511108298618
2008	95.08296059253814
2009	90.68575575099496
2010	88.0650858644535
2011	89.253716316449
2012	91.13542829643427
2013	92.16822991221186
2014	92.33598290424196
2015	100
2016	100.58384908263169
2017	101.84223699014854
2018	102.98290287457314
2019	106.43840306397658
2020	105.12490779570432
2021	105.62686088763506
2022	112.57950002519507
2023	115.91772953975281