Year	Number
1996	-0.201105654239655
1998	-0.139865472912788
2000	-0.319528043270111
2002	-0.335230827331543
2003	-0.395565360784531
2004	-0.300811678171158
2005	-0.390578359365463
2006	-0.36358454823494
2007	-0.339885622262955
2008	-0.101286359131336
2009	-0.327103823423386
2010	-0.358153432607651
2011	-0.354332804679871
2012	-0.395119667053223
2013	-0.380920946598053
2014	-0.369681090116501
2015	-0.434625327587128
2016	-0.573594987392426
2017	-0.613254487514496
2018	-0.610022246837616
2019	-0.643557012081146
2020	-0.584034085273743
2021	-0.591235816478729
2022	-0.634607255458832