Year	Number
1996	-1.14007151126862
1998	-1.19560503959656
2000	-1.15667068958282
2002	-0.895784795284271
2003	-0.494189292192459
2004	-0.493293792009354
2005	-0.406051367521286
2006	-0.277591466903687
2007	-0.34168216586113
2008	-0.30246177315712
2009	-0.317943394184113
2010	-0.319415539503098
2011	-0.299286216497421
2012	-0.357432961463928
2013	-0.327525734901428
2014	-0.247089490294456
2015	-0.318084388971329
2016	-0.382535666227341
2017	-0.435451537370682
2018	-0.396321564912796
2019	-0.449989259243011
2020	-0.451218128204346
2021	-0.458568871021271
2022	-0.456187754869461