Year	Number
1996	-0.328649967908859
1998	-0.399467557668686
2000	-0.314059346914291
2002	-0.662610352039337
2003	-0.491062015295029
2004	-0.413962543010712
2005	-0.281063884496689
2006	-0.387200713157654
2007	-0.467368990182877
2008	-0.422118216753006
2009	-0.355243325233459
2010	-0.331291496753693
2011	-0.390134036540985
2012	-0.385833382606506
2013	-0.404981285333633
2014	-0.420295923948288
2015	-0.462539732456207
2016	-0.519660770893097
2017	-0.57611882686615
2018	-0.513791620731354
2019	-0.515705645084381
2020	-0.55521160364151
2021	-0.627343535423279
2022	-0.630593657493591