Year	Number
1996	0.310659021139145
1998	0.382473677396774
2000	0.467802941799164
2002	0.321516633033752
2003	0.218241095542908
2004	0.126583278179169
2005	-0.0982957854866982
2006	-0.739193975925446
2007	-0.562502324581146
2008	-0.529666900634766
2009	-0.455878525972366
2010	-0.495821505784988
2011	-0.405181705951691
2012	-0.32114115357399
2013	-0.42992576956749
2014	-0.874775230884552
2015	-0.969098031520844
2016	-1.02308261394501
2017	-1.04549336433411
2018	-1.01793563365936
2019	-0.846735775470734
2020	-0.810611665248871
2021	-0.789982855319977
2022	-0.622607707977295