Year	Number
1996	0.221231311559677
1998	0.129340261220932
2000	0.098202221095562
2002	-0.0490107983350754
2003	-0.112911000847816
2004	-0.0490320511162281
2005	-0.269636899232864
2006	-0.318183392286301
2007	-0.329650670289993
2008	-0.385672748088837
2009	-0.262815058231354
2010	-0.21353417634964
2011	-0.275484472513199
2012	-0.292328745126724
2013	-0.344564139842987
2014	-0.130764111876488
2015	-0.181169167160988
2016	-0.273145228624344
2017	-0.278771549463272
2018	-0.248697802424431
2019	-0.236701235175133
2020	-0.188088923692703
2021	-0.24555903673172
2022	-0.197303429245949