Year	Number
1996	-0.656428635120392
1998	-0.907693862915039
2000	-1.06835269927979
2002	-1.18801403045654
2003	-1.26386892795563
2004	-1.08735477924347
2005	-1.25050592422485
2006	-1.12698328495026
2007	-1.30544221401215
2008	-1.39361536502838
2009	-1.42558062076569
2010	-1.16552352905273
2011	-1.24479079246521
2012	-1.32344126701355
2013	-1.16693091392517
2014	-1.28224718570709
2015	-1.24134790897369
2016	-1.35445654392242
2017	-1.12843835353851
2018	-1.17969214916229
2019	-1.10573601722717
2020	-1.00722682476044
2021	-1.03241419792175
2022	-0.943087220191956