Year	Number
1996	-1.53094363212585
1998	-1.1040164232254
2000	-1.24837958812714
2002	-1.41743767261505
2003	-1.56096339225769
2004	-1.3047730922699
2005	-1.41722476482391
2006	-1.14034521579742
2007	-0.916478335857391
2008	-0.875740170478821
2009	-0.991805791854858
2010	-1.00055825710297
2011	-0.976101815700531
2012	-0.868966519832611
2013	-0.838690638542175
2014	-0.9411261677742
2015	-0.804575800895691
2016	-0.71827632188797
2017	-0.569948792457581
2018	-0.701724708080292
2019	-0.694264531135559
2020	-0.811034500598907
2021	-0.937743246555328
2022	-0.807034194469452