Year	base year varies by country
1974	27.115059358007386
1975	28.61152968222096
1976	30.22153673123477
1977	32.754433768807615
1978	32.04319438860323
1979	36.103672651444576
1980	67.19397750037017
1981	73.255946030956
1982	69.71149859447547
1983	61.75042083574234
1984	60.963614533272356
1985	59.46089737472349
1986	40.4900481609712
1987	44.83461442150444
1988	41.396215102494885
1989	44.99687857319752
1990	48.78109975716553
1991	47.39704296852861
1992	48.21553082313823
1993	46.79245448042513
1994	42.691738526990186
1995	43.918271121324175
1996	45.88965507018181
1997	49.82921467679
1998	44.02482194784124
1999	49.12904944866867
2000	63.384191556727245
2001	59.83981218520738
2002	60.06373846425904
2003	63.73039608818208
2004	73.85471174764713
2005	87.71452265655626
2006	96.52783358668857
2007	97.60937747199576
2008	109.99867216855421
2009	85.6984073813418
2010	100
2011	120.18050541516246
2012	121.64514846425104
2013	118.2131481384784
2014	116.03039285443539
2015	95.59418818523048
2016	86.8302452990269
2017	91.13154672833628
2018	99.53010534559556
2019	96.21158911861278
2020	85.75939333573727
2021	99.02287996445746
2022	123.02278488933254
2023	107.15752563243855