Year	base year varies by country
1990	8.80453801517787
1991	10.4848216034586
1992	12.1133477768036
1993	13.7337338625703
1994	14.1362808244988
1995	15.9324888315852
1996	15.9705894728982
1997	16.003593582558
1998	15.979564676881
1999	16.3347461510541
2000	17.4455088893258
2001	16.4414613509098
2002	15.8460446444254
2003	17.8692641904089
2004	18.5681958811552
2005	20.4019002770929
2006	22.7587991638672
2007	26.677996262701
2008	34.7645432745248
2009	43.1589342675924
2010	43.7823962845098
2011	52.5659659349955
2012	70.1973294708744
2013	73.6383880300425
2014	81.7251999043101
2015	90.581386153143
2016	99.9999712390324
2017	106.676824401898
2018	119.885863295834
2019	135.303661045075
2020	160.002790013053
2021	194.824619719042
2022	262.365158400927
2023	348.999951585069