Year	Number
1996	-1.18653774261475
1998	-1.11334598064423
2000	-1.15091466903687
2002	-1.20242607593536
2003	-1.09689700603485
2004	-1.12646734714508
2005	-0.953236162662506
2006	-1.10211932659149
2007	-1.03190290927887
2008	-0.926385998725891
2009	-0.723441064357758
2010	-0.695639729499817
2011	-0.641633808612823
2012	-0.772899031639099
2013	-0.716203808784485
2014	-0.609330892562866
2015	-0.51577353477478
2016	-0.51292759180069
2017	-0.487215578556061
2018	-0.503434121608734
2019	-0.509888172149658
2020	-0.466539710760117
2021	-0.508473932743073
2022	-0.474393337965012