Year	Number
1996	-0.243808045983315
1998	-0.29908287525177
2000	-0.297324925661087
2002	-0.361814767122269
2003	-0.39665812253952
2004	-0.303084462881088
2005	-0.483525156974792
2006	-0.581767320632935
2007	-0.545192837715149
2008	-0.54338139295578
2009	-0.48464497923851
2010	-0.524435043334961
2011	-0.558573603630066
2012	-0.642977952957153
2013	-0.65760612487793
2014	-0.657450437545776
2015	-0.663655161857605
2016	-0.628870189189911
2017	-0.607019066810608
2018	-0.604680120944977
2019	-0.655357837677002
2020	-0.678563237190247
2021	-0.704744577407837
2022	-0.685681581497192