Year	Number
1996	-0.520156919956207
1998	-0.322582125663757
2000	-0.149593204259872
2002	-0.414853543043137
2003	-0.618506610393524
2004	-0.493495106697083
2005	-0.741414427757263
2006	-0.626963675022125
2007	-0.636888325214386
2008	-0.512790739536285
2009	-0.437218874692917
2010	-0.453413218259811
2011	-0.473082095384598
2012	-0.465775460004807
2013	-0.417519450187683
2014	-0.435868889093399
2015	-0.56189900636673
2016	-0.74905401468277
2017	-0.772097945213318
2018	-0.796630501747131
2019	-0.780855536460876
2020	-0.772882997989655
2021	-0.796027064323425
2022	-0.726218461990356