Year	Number
1996	-0.289059728384018
1998	-0.114554695785046
2000	-0.15672767162323
2002	-0.53240829706192
2003	-0.493568599224091
2004	-0.621729493141174
2005	-0.509587168693542
2006	-0.583651542663574
2007	-0.508220851421356
2008	-0.542513906955719
2009	-0.489193111658096
2010	-0.637416422367096
2011	-0.75433361530304
2012	-0.712749183177948
2013	-0.679982602596283
2014	-0.819636702537537
2015	-0.86566561460495
2016	-0.881440103054047
2017	-0.791547000408173
2018	-0.723060786724091
2019	-0.749148666858673
2020	-0.785046398639679
2021	-0.801559805870056
2022	-0.739736258983612