Year	base year varies by country
1990	8.51608573832645
1991	10.6553125961673
1992	12.1558918124891
1993	13.6413460414617
1994	15.356523012529
1995	17.057477102625
1996	19.0056880202814
1997	19.6539699937673
1998	22.8494257076469
1999	25.2897736002887
2000	28.9983938263547
2001	33.0394953572256
2002	38.9698813199153
2003	44.8716066630936
2004	50.182163655674
2005	56.6821710526134
2006	61.701849265625
2007	69.4981899114751
2008	77.9941733959459
2009	80.8393734801476
2010	84.6030133088699
2011	88.9141379741564
2012	93.1804836092814
2013	97.2223511721537
2014	100.00000004973
2015	101.603888060907
2016	105.804959337813
2017	108.089509850963
2018	110.208332520547
2019	113.582778811232
2020	116.086054057161
2021	125.893150203266
2022	136.033164262026
2023	138.84735757134