Year	Number
1996	-0.129939034581184
1998	-0.167377382516861
2000	-0.194564670324326
2002	-0.271161288022995
2003	-0.308505296707153
2004	-0.323487251996994
2005	-0.260493904352188
2006	-0.368648618459702
2007	-0.404348582029343
2008	-0.347913265228271
2009	-0.324280887842178
2010	-0.317569881677628
2011	-0.245334327220917
2012	-0.109142281115055
2013	-0.0732259452342987
2014	-0.262088179588318
2015	-0.224439725279808
2016	-0.210808366537094
2017	-0.193443179130554
2018	-0.147642567753792
2019	-0.175264254212379
2020	-0.294217169284821
2021	-0.322730869054794
2022	-0.296521306037903