Year	Number
1996	0.141708940267563
1998	0.134595617651939
2000	0.0681255981326103
2002	-0.0895186811685562
2003	-0.00807103421539068
2004	-0.114593125879765
2005	-0.0435877293348312
2006	0.191378027200699
2007	0.0667113736271858
2008	0.0878936722874641
2009	-0.00624055694788694
2010	-0.0873018652200699
2011	-0.266437083482742
2012	-0.242597430944443
2013	-0.285445630550385
2014	-0.339506477117538
2015	-0.388389468193054
2016	-0.453965753316879
2017	-0.36236634850502
2018	-0.494956314563751
2019	-0.385123878717422
2020	-0.303489238023758
2021	-0.4002965092659
2022	-0.414175897836685