Year	Number
1996	-0.143133714795113
1998	-0.201571121811867
2000	0.0430850870907307
2002	-0.0346153452992439
2003	0.0817573666572571
2004	-0.0922709181904793
2005	-0.157670244574547
2006	-0.391295492649078
2007	-0.290289968252182
2008	-0.148200899362564
2009	-0.151303574442863
2010	-0.0868625491857529
2011	-0.152404069900513
2012	-0.16054867208004
2013	-0.11827490478754
2014	-0.175329744815826
2015	-0.254576027393341
2016	-0.248414695262909
2017	-0.316740095615387
2018	-0.520446002483368
2019	-0.233971297740936
2020	-0.465359300374985
2021	-0.492295622825623
2022	-0.587532162666321