Year	Number
1996	0.466799110174179
1998	0.638839483261108
2000	0.454958707094193
2002	0.506276667118073
2003	-0.145084381103516
2004	-0.717405676841736
2005	-0.870126605033875
2006	-1.13020014762878
2007	-1.11284792423248
2008	-1.27209329605103
2009	-1.42447113990784
2010	-1.44278836250305
2011	-1.13353371620178
2012	-1.21663069725037
2013	-1.31168270111084
2014	-0.906386315822601
2015	-0.995044946670532
2016	-0.991300225257874
2017	-0.754879355430603
2018	-0.799434542655945
2019	-0.49142050743103
2020	-0.578276574611664
2021	-0.568726181983948
2022	-0.383099317550659