Year	Number
1996	-0.22796842455864
1998	-0.163952499628067
2000	-0.159286215901375
2002	-0.195335179567337
2003	-0.420781254768372
2004	-0.456693708896637
2005	-0.5336874127388
2006	-0.616633772850037
2007	-0.493607431650162
2008	-0.461728304624558
2009	-0.495730012655258
2010	-0.491047918796539
2011	-0.591842174530029
2012	-0.355143368244171
2013	-0.352435141801834
2014	-0.439880818128586
2015	-0.549874782562256
2016	-0.493561118841171
2017	-0.521386206150055
2018	-0.536904513835907
2019	-0.609220564365387
2020	-0.6611088514328
2021	-0.686099588871002
2022	-0.709801018238068