Year	Number
1996	-1.15093290805817
1998	-0.586954712867737
2000	-1.90759003162384
2002	-1.42116582393646
2003	-0.78889536857605
2004	-1.03338360786438
2005	-1.15397679805756
2006	-1.90892851352692
2007	-2.40334820747375
2008	-2.09733891487122
2009	-2.116455078125
2010	-1.6870790719986
2011	-1.38805401325226
2012	-1.2870124578476
2013	-1.22985172271729
2014	-0.95524275302887
2015	-0.386475414037704
2016	-0.396070927381516
2017	-0.69907408952713
2018	-0.880607545375824
2019	-0.842596650123596
2020	-0.669287204742432
2021	-0.939894258975983
2022	-0.864391386508942