Year	Number
1996	-0.596835911273956
1998	-0.544719040393829
2000	-1.2202535867691
2002	-1.10900616645813
2003	-1.17076420783997
2004	-1.14213120937347
2005	-0.976286172866821
2006	-0.886475443840027
2007	-0.94987416267395
2008	-0.838403463363647
2009	-0.855763971805573
2010	-0.798651278018951
2011	-0.829199433326721
2012	-0.843582153320313
2013	-0.799480617046356
2014	-0.716015040874481
2015	-0.722057998180389
2016	-0.69939923286438
2017	-0.693399548530579
2018	-0.813987374305725
2019	-0.862723052501678
2020	-0.877666115760803
2021	-0.841158211231232
2022	-0.862237751483917