Year	Number
1996	-1.13681089878082
1998	-1.04586327075958
2000	-1.04984867572784
2002	-1.17397427558899
2003	-1.22319900989532
2004	-1.10711979866028
2005	-1.08653473854065
2006	-0.763818800449371
2007	-0.690431654453278
2008	-0.827655673027039
2009	-0.712426066398621
2010	-0.722509026527405
2011	-0.693881630897522
2012	-0.708632588386536
2013	-0.699207544326782
2014	-0.655200660228729
2015	-0.719569623470306
2016	-0.459497153759003
2017	-0.451012492179871
2018	-0.464358031749725
2019	-0.341410756111145
2020	-0.287810236215591
2021	-0.418762296438217
2022	-0.459634959697723