Year	Number
1996	-0.261528313159943
1998	-0.227260559797287
2000	-0.368222206830978
2002	-0.378112554550171
2003	-0.46946907043457
2004	-0.626744568347931
2005	-0.765424847602844
2006	-0.85372930765152
2007	-0.832326352596283
2008	-0.978549301624298
2009	-1.11391890048981
2010	-1.02979016304016
2011	-0.984035789966583
2012	-1.01876401901245
2013	-1.05081140995026
2014	-1.05817568302155
2015	-1.16192066669464
2016	-1.23817598819733
2017	-1.2447555065155
2018	-1.21184551715851
2019	-1.18922472000122
2020	-1.2192155122757
2021	-1.17688238620758
2022	-1.30090224742889