Year	Number
1996	-0.466122418642044
1998	-0.740443408489227
2000	-1.31881785392761
2002	-1.51587021350861
2003	-1.08758056163788
2004	-1.20470404624939
2005	-1.26764357089996
2006	-0.931996047496796
2007	-1.1103447675705
2008	-1.21233808994293
2009	-1.16718089580536
2010	-1.10401391983032
2011	-0.945328533649445
2012	-0.778662025928497
2013	-0.665949761867523
2014	-0.713570177555084
2015	-0.619207262992859
2016	-0.620809733867645
2017	-0.710430860519409
2018	-0.721038401126862
2019	-0.943286120891571
2020	-1.05272817611694
2021	-0.954425930976868
2022	-0.884499907493591