Year	Number
1996	-0.152148813009262
1998	-0.120933815836906
2000	-0.409486442804337
2002	-0.293485134840012
2003	-0.363617956638336
2004	-0.471536189317703
2005	-0.28536656498909
2006	-0.0368776172399521
2007	0.172825917601585
2008	0.0425143949687481
2009	-0.302319407463074
2010	0.0131317190825939
2011	-0.0704314634203911
2012	-0.0922749042510986
2013	-0.777284979820251
2014	-2.02083349227905
2015	-1.95953238010406
2016	-1.8533319234848
2017	-1.86741673946381
2018	-1.87208938598633
2019	-1.42832672595978
2020	-1.16391623020172
2021	-1.12695300579071
2022	-1.99760496616364