Year	Number
1996	-1.33498477935791
1998	-1.31328856945038
2000	-1.32529211044312
2002	-1.20911192893982
2003	-0.981341302394867
2004	-1.12543630599976
2005	-1.19940960407257
2006	-1.09145569801331
2007	-1.03304481506348
2008	-1.03422832489014
2009	-1.02055108547211
2010	-1.07531774044037
2011	-1.16692554950714
2012	-1.27243947982788
2013	-1.21758460998535
2014	-1.17845451831818
2015	-1.09618330001831
2016	-1.17888486385345
2017	-1.2256121635437
2018	-1.16267454624176
2019	-1.21871328353882
2020	-1.14034998416901
2021	-1.11718237400055
2022	-1.12793481349945