Year	Number
1996	-1.17785394191742
1998	-1.08974099159241
2000	-1.39924204349518
2002	-0.724512279033661
2003	-1.19315183162689
2004	-1.51459443569183
2005	-1.2677013874054
2006	-0.908794343471527
2007	-0.863382518291473
2008	-0.749933898448944
2009	-0.969926595687866
2010	-0.929458737373352
2011	-0.998262107372284
2012	-0.817712664604187
2013	-0.736093640327454
2014	-0.943617463111877
2015	-1.03222346305847
2016	-0.947688162326813
2017	-0.642759621143341
2018	-0.538375675678253
2019	-0.551099121570587
2020	-0.667409420013428
2021	-0.707901835441589
2022	-0.918995440006256