Year	base year varies by country
1980	8.380426676318827
1981	9.590797304630625
1982	13.467206395607201
1983	16.800309530171564
1984	21.107433744140877
1985	32.24683685718656
1986	31.304129695387562
1987	31.779379805836022
1988	33.0432408159483
1989	31.45853280358153
1990	34.71528585680387
1991	35.94841187939366
1992	30.4038365022137
1993	29.585026093369244
1994	36.8411521758725
1995	39.67085995217873
1996	39.99663561084735
1997	34.738208465286306
1998	23.772775115745624
1999	33.08162940715663
2000	54.49702958010884
2001	47.97290273266286
2002	47.21354432240092
2003	47.5136439506185
2004	55.5542655500287
2005	88.51408390742502
2006	100
2007	103.0376538593557
2008	123.48036450002017
2009	97.75911938638093
2010	122.1075278706518
2011	142.92088612601
2012	149.85938364266835
2013	148.25188136182928
2014	146.36338567231692
2015	116.80859257350153
2016	109.46667946802349
2017	123.41534319779069
2018	135.15687444660674
2019	130.8809301502747
2020	117.5722428953667
2021	138.66309338025843
2022	166.03157598450258
2023	153.81101732630952