Year	Number
1996	-0.834202289581299
1998	-1.21932327747345
2000	-1.04596066474915
2002	-0.881491482257843
2003	-0.850086212158203
2004	-1.18835949897766
2005	-1.12447786331177
2006	-0.980062365531921
2007	-1.13529062271118
2008	-1.19747388362885
2009	-1.1950798034668
2010	-1.12364184856415
2011	-1.12446665763855
2012	-1.22891986370087
2013	-1.28914284706116
2014	-1.21222698688507
2015	-1.23459827899933
2016	-1.24513328075409
2017	-1.22406458854675
2018	-1.24348342418671
2019	-1.27179884910583
2020	-1.2862263917923
2021	-1.27552962303162
2022	-1.32148897647858