Year	base year varies by country
1972	0.616916883678128
1973	0.701904589465421
1974	0.9181207470418066
1975	1.0421526552908975
1976	1.1690708463743638
1977	1.2003037327336532
1978	1.3380985711965663
1979	1.5224524646536948
1980	1.6067388736105797
1981	1.7212631669986453
1982	1.893277859297379
1983	2.023358760977837
1984	2.319076609624701
1985	2.4247715471418565
1986	2.9689561840496514
1987	3.662563711174412
1988	4.063617698620633
1989	4.741661198191773
1990	6.10301283278267
1991	9.478806608748446
1992	12.472803539089664
1993	14.940604596674229
1994	18.742658379868995
1995	24.74488895067956
1996	31.132086166459317
1997	34.177046734977765
1998	34.05382122181083
1999	37.38698644603002
2000	38.056417054120054
2001	41.01794744467047
2002	42.20448850214727
2003	44.289195377590296
2004	47.22228986655998
2005	48.99735510111053
2006	51.076465640445534
2007	55.27686101377426
2008	61.327054218690336
2009	64.84410829615847
2010	69.4503788377193
2011	78.48554608410738
2012	81.93042982613109
2013	83.46108094204445
2014	86.24795882111009
2015	88.84158810880615
2016	92.38656355735667
2017	95.20982820173008
2018	98.33571964817412
2019	100
2020	99.9551045943206
2021	108.63831494207103
2022	119.41994372277036
2023	121.17355913403219