Year	base year varies by country
1990	4.9486985259893
1991	8.15420248813028
1992	9.762933121293
1993	10.7817510531057
1994	12.4713029086434
1995	15.1197391975637
1996	17.3990499869331
1997	19.9532118950633
1998	22.3352652258097
1999	24.7987269060483
2000	27.1272563263351
2001	29.7642800693996
2002	32.6772763130492
2003	36.1568301367188
2004	40.9838933026055
2005	46.3172607175924
2006	52.3312376594322
2007	57.8348019057919
2008	64.4417257874399
2009	70.6934308524083
2010	75.3795887466929
2011	78.8419429690948
2012	82.574031174427
2013	86.3643539920056
2014	91.7249207202092
2015	95.3528389066229
2016	97.220576749505
2017	100
2018	102.192478428228
2019	104.815546909463
2020	105.625344746431
2021	108.13302861564
2022	114.924199272791
2023	114.8231549323