Year	Number
1996	-0.361192047595978
1998	-0.141035705804825
2000	-0.230174466967583
2002	-0.338848352432251
2003	-0.196023553609848
2004	-0.246132239699364
2005	-0.206432834267616
2006	-0.41343030333519
2007	-0.40017232298851
2008	-0.440627247095108
2009	-0.3320132791996
2010	-0.360339462757111
2011	-0.353244036436081
2012	-0.397404074668884
2013	-0.372476398944855
2014	-0.480519980192184
2015	-0.555550456047058
2016	-0.451497614383698
2017	-0.445774883031845
2018	-0.458018720149994
2019	-0.471759527921677
2020	-0.483637541532516
2021	-0.478348255157471
2022	-0.452194035053253