Year	Number
1996	-0.555694162845612
1998	-0.515584170818329
2000	-0.486816674470901
2002	-0.0830336138606071
2003	-0.0743419826030731
2004	-0.365095525979996
2005	-0.535383820533752
2006	-0.746408820152283
2007	-0.576470911502838
2008	-0.785068154335022
2009	-0.60821795463562
2010	-0.712734580039978
2011	-0.641656637191772
2012	-0.793573498725891
2013	-0.846679747104645
2014	-0.932531476020813
2015	-0.939487814903259
2016	-0.762290120124817
2017	-0.774360239505768
2018	-0.812102079391479
2019	-0.865797400474548
2020	-0.815018534660339
2021	-0.84181272983551
2022	-0.798844754695892