Year	Number
1996	-0.823546648025513
1998	-0.982280313968658
2000	-1.09372007846832
2002	-0.84399551153183
2003	-0.823217570781708
2004	-0.77508807182312
2005	-0.804544687271118
2006	-0.821370303630829
2007	-0.746359884738922
2008	-0.703015565872192
2009	-0.786728382110596
2010	-0.844159185886383
2011	-0.851141273975372
2012	-0.81733900308609
2013	-0.84464156627655
2014	-0.829405069351196
2015	-0.872506380081177
2016	-0.815906703472137
2017	-0.754658937454224
2018	-0.759869158267975
2019	-0.744596004486084
2020	-0.712013125419617
2021	-0.6813605427742
2022	-0.918780207633972