Year	Number
1996	-0.286933869123459
1998	-0.340585500001907
2000	-0.357144564390183
2002	-0.765085935592651
2003	-0.77983832359314
2004	-0.860001802444458
2005	-0.827298045158386
2006	-0.893325328826904
2007	-0.571937680244446
2008	-0.586309432983398
2009	-0.537756443023682
2010	-0.469919919967651
2011	-0.473825514316559
2012	-0.509652614593506
2013	-0.50924026966095
2014	-0.656963586807251
2015	-0.738129317760468
2016	-0.795228838920593
2017	-0.726111114025116
2018	-0.801292061805725
2019	-0.798726916313171
2020	-0.818331599235535
2021	-0.792836785316467
2022	-0.840930998325348