Year	Number
1996	-0.515926837921143
1998	-0.605091035366058
2000	-0.862790763378143
2002	-0.677636325359344
2003	-0.560249149799347
2004	-0.788531184196472
2005	-0.614661514759064
2006	-0.752042233943939
2007	-0.788387358188629
2008	-0.808183550834656
2009	-0.786913633346558
2010	-0.837366938591003
2011	-0.725575923919678
2012	-0.733911514282227
2013	-0.674381673336029
2014	-0.714282214641571
2015	-0.755197107791901
2016	-0.657136380672455
2017	-0.662410616874695
2018	-1.07868373394012
2019	-1.20152318477631
2020	-1.19912230968475
2021	-1.36525428295135
2022	-1.30988025665283