Year	Number
1996	-0.1044110506773
1998	0.0239137783646584
2000	0.0260655991733074
2002	-0.195086255669594
2003	-0.215569257736206
2004	-0.224266529083252
2005	-0.403397768735886
2006	-0.269640743732452
2007	-0.34261354804039
2008	-0.356555700302124
2009	-0.283303052186966
2010	-0.230588346719742
2011	-0.266206502914429
2012	-0.141056269407272
2013	-0.0847627595067024
2014	-0.135500743985176
2015	-0.147569045424461
2016	-0.193094283342361
2017	-0.304876983165741
2018	-0.349293291568756
2019	-0.25156381726265
2020	-0.188582316040993
2021	-0.173474416136742
2022	-0.131649643182755