Year	Number
1996	-0.469098508358002
1998	-0.380856782197952
2000	-0.50101625919342
2002	-0.438531368970871
2003	-0.302864640951157
2004	-0.481950610876083
2005	-0.388776749372482
2006	-0.544567346572876
2007	-0.496518045663834
2008	-0.337751358747482
2009	-0.468710690736771
2010	-0.48135831952095
2011	-0.437706410884857
2012	-0.418281972408295
2013	-0.340971231460571
2014	-0.41779625415802
2015	-0.46325758099556
2016	-0.160720765590668
2017	-0.209941223263741
2018	-0.19733352959156
2019	-0.177528098225594
2020	-0.125852257013321
2021	-0.119232147932053
2022	-0.168567225337029