Year	Number
1996	0.36849319934845
1998	0.352811932563782
2000	0.345234483480453
2002	0.382046699523926
2003	0.059730738401413
2004	-0.16634014248848
2005	-0.224495947360992
2006	0.240350216627121
2007	-0.279368013143539
2008	-0.643881678581238
2009	-0.882854044437408
2010	-1.07616984844208
2011	-1.17367887496948
2012	-1.13399171829224
2013	-1.01476144790649
2014	-0.589508354663849
2015	-0.635684847831726
2016	-0.748691558837891
2017	-0.629497826099396
2018	-0.632418096065521
2019	-0.562930703163147
2020	-0.700950503349304
2021	-0.555529892444611
2022	-0.507473766803741