Year	Number
2004	-0.0813340544700623
2005	-0.410195916891098
2006	-0.727358162403107
2007	-0.819225966930389
2008	-1.09334015846252
2009	-1.01151645183563
2010	-1.15294754505157
2011	-1.17682337760925
2012	-1.2315913438797
2013	-1.30670404434204
2014	-0.875857710838318
2015	-0.65231066942215
2016	-0.571276485919952
2017	-0.778954982757568
2018	-0.470841705799103
2019	-0.403398483991623
2020	-0.317361801862717
2021	-0.292559325695038
2022	-0.144963636994362