Year	Number
1996	-0.68063485622406
1998	-0.681749761104584
2000	-0.824704229831696
2002	-0.75989693403244
2003	-0.874153017997742
2004	-0.978404879570007
2005	-0.957180440425873
2006	-1.10150361061096
2007	-1.16698491573334
2008	-1.08823239803314
2009	-1.13256120681763
2010	-1.16890013217926
2011	-1.20837116241455
2012	-1.46860635280609
2013	-1.42611384391785
2014	-1.26783466339111
2015	-1.28679203987122
2016	-1.27832186222076
2017	-1.31923758983612
2018	-1.47806668281555
2019	-1.49680662155151
2020	-1.56294918060303
2021	-1.59939134120941
2022	-1.518141746521