Year	Number
1996	-0.841568291187286
1998	-0.690857768058777
2000	-0.434178411960602
2002	-0.5270756483078
2003	-0.474271208047867
2004	-0.517802238464355
2005	-0.614453136920929
2006	-0.483886420726776
2007	-0.485150635242462
2008	-0.493136614561081
2009	-0.412360966205597
2010	-0.480537474155426
2011	-0.351987540721893
2012	-0.257835358381271
2013	-0.377716362476349
2014	-0.498851090669632
2015	-0.580959022045136
2016	-0.581205725669861
2017	-0.511013925075531
2018	-0.673881351947784
2019	-0.717234313488007
2020	-0.759016036987305
2021	-0.889699339866638
2022	-0.714570105075836