Year	Number
1996	-0.181543231010437
1998	0.0688348412513733
2000	0.0799881815910339
2002	0.089251734316349
2003	-0.0520304851233959
2004	0.0201852153986692
2005	0.00981641840189695
2006	-0.221306219696999
2007	-0.239804193377495
2008	-0.280423700809479
2009	-0.367224395275116
2010	-0.397503405809402
2011	-0.456045746803284
2012	-0.28196707367897
2013	-0.236131489276886
2014	-0.07551059871912
2015	-0.158801630139351
2016	-0.122207462787628
2017	-0.169250667095184
2018	-0.223899483680725
2019	-0.215916842222214
2020	-0.319043964147568
2021	-0.401197373867035
2022	-0.26250022649765