Year	Number
1996	-0.260566830635071
1998	-0.497031658887863
2000	-0.777199268341064
2002	-0.801531195640564
2003	-1.01384484767914
2004	-1.24132347106934
2005	-1.24978721141815
2006	-1.20752882957458
2007	-1.09506964683533
2008	-1.11905133724213
2009	-1.11738514900208
2010	-1.17285454273224
2011	-1.03099358081818
2012	-0.838509380817413
2013	-0.739937126636505
2014	-0.418946444988251
2015	-0.462348997592926
2016	-0.555268585681915
2017	-0.550527215003967
2018	-0.52569717168808
2019	-0.564522325992584
2020	-0.55229663848877
2021	-0.395680397748947
2022	-0.348596215248108