Year	Number
1996	-0.912984549999237
1998	-0.796306788921356
2000	-0.520087063312531
2002	-0.297508209943771
2003	-0.334958344697952
2004	-0.384915322065353
2005	-0.292555779218674
2006	-0.250743836164474
2007	-0.287419378757477
2008	-0.373598515987396
2009	-0.54454094171524
2010	-0.605530261993408
2011	-0.55234831571579
2012	-0.576099574565887
2013	-0.659140110015869
2014	-0.716764986515045
2015	-0.809338331222534
2016	-0.735103726387024
2017	-0.737336754798889
2018	-0.785894691944122
2019	-0.788889169692993
2020	-0.811572015285492
2021	-0.836634576320648
2022	-0.815499842166901