Year	Number
1996	0.143011912703514
1998	0.195513546466827
2000	0.20732094347477
2002	0.149915769696236
2003	0.165346130728722
2004	-0.118548452854156
2005	0.068797342479229
2006	-0.301703035831451
2007	-0.352246403694153
2008	-0.382103830575943
2009	-0.368749797344208
2010	-0.33560249209404
2011	-0.378444939851761
2012	-0.436850935220718
2013	-0.447350561618805
2014	-0.461533755064011
2015	-0.440686821937561
2016	-0.494319975376129
2017	-0.555783927440643
2018	-0.666695117950439
2019	-0.559759736061096
2020	-0.55057954788208
2021	-0.424278557300568
2022	-0.438766330480576