Year	Number
1996	-1.22748148441315
1998	-1.30327725410461
2000	-1.2032698392868
2002	-1.00055944919586
2003	-1.16619169712067
2004	-1.00858783721924
2005	-1.2989250421524
2006	-1.16888105869293
2007	-1.1720095872879
2008	-1.22255659103394
2009	-1.28030228614807
2010	-1.25216734409332
2011	-1.25671803951263
2012	-1.35431361198425
2013	-1.35320031642914
2014	-1.22218954563141
2015	-1.27837598323822
2016	-1.2065657377243
2017	-1.41772937774658
2018	-1.4128532409668
2019	-1.29221296310425
2020	-1.4521666765213
2021	-1.23300182819366
2022	-1.26143133640289