Year	Number
1996	-0.933221638202667
1998	-0.912859261035919
2000	-0.732384085655212
2002	-0.799848556518555
2003	-0.624177575111389
2004	-0.535743415355682
2005	-0.500521123409271
2006	-0.433823466300964
2007	-0.395825952291489
2008	-0.344681531190872
2009	-0.20417246222496
2010	-0.194905057549477
2011	-0.350398898124695
2012	-0.425855100154877
2013	-0.52661395072937
2014	-0.545646905899048
2015	-0.541016101837158
2016	-0.454765856266022
2017	-0.414195448160172
2018	-0.458880722522736
2019	-0.465154021978378
2020	-0.468150287866592
2021	-0.464600652456284
2022	-0.607678949832916