Year	Number
1996	-0.0481699667870998
1998	-0.170989289879799
2000	-0.301753908395767
2002	-0.456903666257858
2003	-0.574796617031097
2004	-0.56948184967041
2005	-0.45302626490593
2006	-0.407716184854507
2007	-0.317137002944946
2008	-0.201634988188744
2009	-0.17781800031662
2010	-0.147598043084145
2011	-0.246938586235046
2012	-0.385591775178909
2013	-0.557433128356934
2014	-0.687225043773651
2015	-0.796363055706024
2016	-0.892875909805298
2017	-0.812941491603851
2018	-0.804274797439575
2019	-0.758563220500946
2020	-0.571031153202057
2021	-0.519896507263184
2022	-0.713920831680298