Year	Number
1996	-0.481185793876648
1998	-0.257059156894684
2000	-1.39048433303833
2002	-0.858753323554993
2003	-1.55980968475342
2004	-1.70588445663452
2005	-1.17878663539886
2006	-1.63867163658142
2007	-1.60488569736481
2008	-1.77923631668091
2009	-1.7287632226944
2010	-1.65075957775116
2011	-1.39218163490295
2012	-1.18824028968811
2013	-1.08425319194794
2014	-0.713820934295654
2015	-0.854724228382111
2016	-1.37869036197662
2017	-1.18929064273834
2018	-1.09619224071503
2019	-0.928045392036438
2020	-0.778701364994049
2021	-0.984003067016602
2022	-0.712976396083832