Year	Number
1996	-0.378730356693268
1998	-0.291684538125992
2000	-0.325786858797073
2002	-0.115116655826569
2003	-0.214628025889397
2004	-0.375969409942627
2005	-0.373126298189163
2006	-0.489525705575943
2007	-0.537642061710358
2008	-0.523842573165894
2009	-0.663388073444366
2010	-0.561575889587402
2011	-0.575659573078156
2012	-0.626131415367126
2013	-0.537945449352264
2014	-0.425771981477737
2015	-0.447768539190292
2016	-0.0963440239429474
2017	-0.277832061052322
2018	-0.246496841311455
2019	-0.234557524323463
2020	-0.420242369174957
2021	-0.516419470310211
2022	-0.424908697605133