Year	Number
1996	-0.512254357337952
1998	-0.523701608181
2000	-0.406262516975403
2002	-0.26433065533638
2003	-0.204286307096481
2004	-0.140631452202797
2005	-0.145389392971992
2006	-0.175137788057327
2007	-0.279160350561142
2008	-0.261542618274689
2009	-0.337012529373169
2010	-0.42333310842514
2011	-0.317527681589127
2012	-0.422298341989517
2013	-0.441052585840225
2014	-0.397179245948792
2015	-0.352239668369293
2016	-0.384032636880875
2017	-0.42944523692131
2018	-0.339970648288727
2019	-0.283157199621201
2020	-0.251915633678436
2021	-0.365435123443604
2022	-0.361808151006699