Year	Number
1996	-0.827540695667267
1998	-0.681777358055115
2000	-0.670608699321747
2002	-1.00346577167511
2003	-1.24825465679169
2004	-1.30935919284821
2005	-0.99437552690506
2006	-1.01479351520538
2007	-1.083287358284
2008	-0.988077700138092
2009	-1.00347208976746
2010	-1.10421741008759
2011	-1.08749830722809
2012	-1.24113500118256
2013	-1.47468733787537
2014	-1.3910037279129
2015	-1.22374987602234
2016	-1.08035552501678
2017	-1.10617685317993
2018	-1.20345211029053
2019	-1.22185385227203
2020	-1.30442202091217
2021	-1.19445514678955
2022	-1.21139430999756