Year	Number
1996	-0.0219424981623888
1998	-0.110562637448311
2000	-0.18183496594429
2002	-0.265604585409164
2003	-0.210054367780685
2004	-0.186782702803612
2005	-0.154217436909676
2006	-0.134708419442177
2007	-0.105703733861446
2008	-0.0155702503398061
2009	0.053940374404192
2010	0.106409564614296
2011	0.104707606136799
2012	0.0929005369544029
2013	0.190192177891731
2014	0.242191851139069
2015	0.204612627625465
2016	0.453534781932831
2017	0.435917228460312
2018	0.36751726269722
2019	0.415537625551224
2020	0.368579715490341
2021	0.381128638982773
2022	0.404155731201172