Year	Number
1996	-1.22957599163055
1998	-1.11045014858246
2000	-1.10104322433472
2002	-1.26344680786133
2003	-1.19539868831635
2004	-1.27017319202423
2005	-1.17200481891632
2006	-1.22781145572662
2007	-1.36868393421173
2008	-1.42630350589752
2009	-1.30284023284912
2010	-0.917964994907379
2011	-0.887738704681396
2012	-1.01388883590698
2013	-1.0223114490509
2014	-0.857567131519318
2015	-0.857851386070251
2016	-0.760865032672882
2017	-0.739428520202637
2018	-0.768330097198486
2019	-0.768409550189972
2020	-0.919305801391602
2021	-0.988577723503113
2022	-1.07498741149902