Year	Number
1996	-1.16601467132568
1998	-1.32642936706543
2000	-1.37370228767395
2002	-1.36506843566895
2003	-1.43683886528015
2004	-1.42646288871765
2005	-1.35583305358887
2006	-1.16153120994568
2007	-1.21103572845459
2008	-0.979693531990051
2009	-0.788950502872467
2010	-0.707593381404877
2011	-0.695635735988617
2012	-0.850602805614471
2013	-1.04777801036835
2014	-1.0106920003891
2015	-1.01829671859741
2016	-0.762674689292908
2017	-0.750454783439636
2018	-0.870616137981415
2019	-0.893414497375488
2020	-0.857943475246429
2021	-1.02597737312317
2022	-1.09022343158722