Year	base year varies by country
1990	18.3693696513777
1991	19.7003543693449
1992	22.2923403569005
1993	25.3214235645961
1994	27.0806041453229
1995	29.6637740342668
1996	33.2483123686068
1997	36.0655158338807
1998	40.0877881591105
1999	43.1643572194982
2000	45.5638913737857
2001	50.0779071153686
2002	55.7262461172386
2003	59.211271861897
2004	61.4392956116042
2005	68.0128739237694
2006	73.6876784537668
2007	80.5364657443008
2008	85.7142857142857
2009	89.8912516450786
2010	91.4601037970528
2011	95.5546152309085
2012	100
2013	102.352274337537
2014	106.108884867287
2015	109.671780311056
2016	110.05008481296
2017	112.885729587614
2018	121.756148414917
2019	123.267511177347
2020	121.633085896076
2021	114.937494125388
2022	117.255337506655
2023	121.817047075606