Year	Number
1996	-0.653052270412445
1998	-0.370705366134644
2000	-0.182711690664291
2002	-0.249034658074379
2003	-0.40603095293045
2004	-0.483542829751968
2005	-0.39670604467392
2006	-0.754506230354309
2007	-0.706393182277679
2008	-0.624440610408783
2009	-0.503719747066498
2010	-0.461410343647003
2011	-0.403134196996689
2012	-0.414806485176086
2013	-0.52240663766861
2014	-0.472979217767715
2015	-0.564170300960541
2016	-0.611847817897797
2017	-0.724674940109253
2018	-0.720236599445343
2019	-0.755193710327148
2020	-0.681152164936066
2021	-0.705375611782074
2022	-0.840579450130463