Year	Number
1996	-0.55334997177124
1998	-0.443266034126282
2000	-0.159504070878029
2002	-0.381400048732758
2003	-0.381630450487137
2004	-0.378129839897156
2005	-0.291889518499374
2006	-0.283315151929855
2007	-0.313716232776642
2008	-0.41364324092865
2009	-0.349533259868622
2010	-0.41047203540802
2011	-0.363154947757721
2012	-0.480885624885559
2013	-0.478094786405563
2014	-0.47507643699646
2015	-0.4249567091465
2016	-0.31153193116188
2017	-0.256514042615891
2018	-0.225996732711792
2019	-0.150565445423126
2020	-0.128488674759865
2021	-0.0908545926213264
2022	-0.0504464171826839