Year	Number
1996	-0.348653882741928
1998	-0.198783293366432
2000	-0.158842876553535
2002	-0.123097203671932
2003	-0.147587299346924
2004	-0.109930388629436
2005	-0.140640497207642
2006	0.0357880145311356
2007	0.165997371077538
2008	0.165779024362564
2009	0.0932420492172241
2010	0.0918448567390442
2011	0.0836087092757225
2012	0.0153677640482783
2013	-0.00465791253373027
2014	0.355403989553452
2015	0.417484968900681
2016	0.356864213943481
2017	0.416717708110809
2018	0.496618092060089
2019	0.54490339756012
2020	0.644194781780243
2021	0.809331774711609
2022	0.495032012462616