Year	base year varies by country
1977	29.83546375565981
1978	34.98902885296681
1979	38.355529049776806
1980	41.82642184878942
1981	42.95937184749123
1982	44.74803010824565
1983	45.37158707070722
1984	48.371741632372895
1985	52.60334277491005
1986	54.88372601883442
1987	57.66048606560966
1988	61.55917054688599
1989	67.09727406799662
1990	67.10796408432887
1991	71.58400463753276
1992	74.45565463121329
1993	75.8579709085613
1994	78.27841891490722
1995	80.66837695661235
1996	82.82471084615968
1997	84.30288944189535
1998	85.76796665311218
1999	86.72984524948075
2000	89.21294654052626
2001	91.12582997047812
2002	91.46495170865727
2003	91.394457751984
2004	93.25081446444113
2005	95.57251908396947
2006	100
2007	102.3194437271099
2008	110.34919641217644
2009	110.3382720641415
2010	110.86766648204164
2011	111.11657258831738
2012	115.47917591260781
2013	118.85474568479124
2014	119.77612303499296
2015	123.08001810591962
2016	126.3345556476209
2017	128.26264015901216
2018	127.36010804778041
2019	131.59805760510258
2020	131.20328239902014
2021	134.8642709065511
2022	137.055736563285
2023	140.99215941484914