Year	Number
1996	-0.270569711923599
1998	-0.402136474847794
2000	-0.59584903717041
2002	-0.387543082237244
2003	-0.282097160816193
2004	-0.324706375598907
2005	-0.23280867934227
2006	-0.301414400339127
2007	-0.374117344617844
2008	-0.360781222581863
2009	-0.379986047744751
2010	-0.336401551961899
2011	-0.326692938804626
2012	-0.309364050626755
2013	-0.2444027364254
2014	-0.299684911966324
2015	-0.417167663574219
2016	-0.485800504684448
2017	-0.553566336631775
2018	-0.605827152729034
2019	-0.646842896938324
2020	-0.642686784267426
2021	-0.665344417095184
2022	-0.683835208415985