Year	Number
1996	-0.0978488251566887
1998	-0.394105225801468
2000	-0.20991687476635
2002	-0.327627182006836
2003	-0.56535792350769
2004	-0.39068067073822
2005	-0.501756608486176
2006	-0.540030121803284
2007	-0.500553727149963
2008	-0.49308842420578
2009	-0.451781332492828
2010	-0.65706068277359
2011	-0.602054834365845
2012	-0.538782060146332
2013	-0.543789923191071
2014	-0.522584021091461
2015	-0.552559673786163
2016	-0.502221345901489
2017	-0.232558473944664
2018	-0.298641502857208
2019	-0.259810864925385
2020	-0.473098784685135
2021	-0.51672887802124
2022	-0.441073626279831