Year	Number
1996	-0.860740303993225
1998	-1.19879674911499
2000	-0.943886816501617
2002	-1.00901794433594
2003	-1.09013664722443
2004	-1.03629004955292
2005	-1.05943977832794
2006	-1.10827851295471
2007	-1.16095578670502
2008	-1.19324886798859
2009	-1.2138409614563
2010	-1.15732026100159
2011	-1.14499390125275
2012	-1.22975122928619
2013	-1.17657339572906
2014	-1.19982445240021
2015	-1.2709356546402
2016	-1.22708809375763
2017	-1.36760818958282
2018	-1.37775588035583
2019	-1.43592858314514
2020	-1.46041822433472
2021	-1.39148437976837
2022	-1.35945165157318