Year	base year varies by country
1970	8.857598289283155
1971	9.649023538140552
1972	10.352978513468562
1973	11.470955107465189
1974	13.651153003746607
1975	16.800753005903125
1976	19.556301953016792
1977	22.164831176579707
1978	24.39689113740706
1979	27.847263794734317
1980	32.548974194733425
1981	35.97559113957824
1982	38.8355277584712
1983	41.04682989874648
1984	43.20524919566541
1985	45.61455819626221
1986	47.602618460127786
1987	50.22356611989432
1988	53.45055481631892
1989	57.22397513222338
1990	60.91540364482187
1991	64.37585770795792
1992	66.11214652937814
1993	67.2746736572566
1994	68.45680311291633
1995	70.63324033188843
1996	73.2581373234728
1997	73.57059574578015
1998	74.505332288141
1999	75.22596972380865
2000	76.23525302972554
2001	77.1192001770358
2002	78.46311927884521
2003	80.16477861126631
2004	82.01164766833176
2005	84.30202774449864
2006	86.82358511677305
2007	88.83258368080445
2008	92.40972674197467
2009	93.09978598883023
2010	94.27899204541626
2011	96.69105440852567
2012	97.8706638968213
2013	99.49673621961934
2014	100.1400546023
2015	100
2016	101.98997966884984
2017	104.34921827089892
2018	106.3559043393842
2019	108.37368777745313
2020	113.5322363652783
2021	113.8533589369481
2022	120.78849442883796
2023	127.97714847818737