Year	Number
1996	-0.725473284721375
1998	-0.79578822851181
2000	-0.906720697879791
2002	-0.853914260864258
2003	-0.760160028934479
2004	-0.793166995048523
2005	-1.1232408285141
2006	-1.31729280948639
2007	-1.32194709777832
2008	-1.38291394710541
2009	-1.32975375652313
2010	-1.26945745944977
2011	-1.19611263275146
2012	-1.1348477602005
2013	-1.11489605903625
2014	-0.935829699039459
2015	-1.01296901702881
2016	-1.04268062114716
2017	-0.947567045688629
2018	-0.928147077560425
2019	-0.913639008998871
2020	-0.959660351276398
2021	-1.09884703159332
2022	-1.14780843257904