Year	Number
1996	0.401667177677155
1998	0.40150597691536
2000	0.346064269542694
2002	0.237328082323074
2003	-0.109425097703934
2004	-0.463267117738724
2005	-0.541059792041779
2006	-0.274057030677795
2007	-0.288336992263794
2008	-0.293066412210464
2009	-0.184565529227257
2010	-0.237911432981491
2011	-0.182666853070259
2012	-0.172321394085884
2013	-0.171335309743881
2014	0.0133213326334953
2015	-0.0674014985561371
2016	-0.0832962244749069
2017	0.152436047792435
2018	0.153065830469131
2019	0.13326607644558
2020	0.119538024067879
2021	0.23190039396286
2022	0.284455984830856