Year	base year varies by country
1990	8.02487995353816
1991	7.48100976098362
1992	6.4239686412512
1993	6.18042814047753
1994	5.93965889719884
1995	6.12013770503849
1996	6.66999433668547
1997	6.47796198893337
1998	4.72576077067955
1999	5.10414361243002
2000	5.13619253124616
2001	5.12946975797072
2002	5.26862972288856
2003	5.73233634551563
2004	6.16865452033438
2005	6.4855136966903
2006	6.35465686777392
2007	6.4115238547498
2008	6.49802957908172
2009	8.10143659068245
2010	8.31009200818182
2011	8.49056734812468
2012	8.90286467276183
2013	9.62320793968797
2014	9.68335053396418
2015	9.71892906687268
2016	9.91467750544282
2017	10.2177597840051
2018	30.7319129404559
2019	100
2020	704.945864228018
2021	1503.61414467397
2022	5481.8855878659
2023	52653.4451209017