Year	Number
1996	-0.600068271160126
1998	-0.490328997373581
2000	-0.492341905832291
2002	-0.616700828075409
2003	-0.565392553806305
2004	-0.501296877861023
2005	-0.662730693817139
2006	-0.555354535579681
2007	-0.648909568786621
2008	-0.682821750640869
2009	-0.577192842960358
2010	-0.49773833155632
2011	-0.452714681625366
2012	-0.542041420936584
2013	-0.689305484294891
2014	-0.437423348426819
2015	-0.252853631973267
2016	-0.237044528126717
2017	-0.241859778761864
2018	-0.478516161441803
2019	-0.599489986896515
2020	-1.0171332359314
2021	-0.886557579040527
2022	-0.882116675376892