Year	Number
2008	-0.328292846679688
2009	-0.399734556674957
2010	-0.502526104450226
2011	-0.536440134048462
2012	-0.433817923069
2013	-0.649806022644043
2014	-0.478502005338669
2015	0.515011131763458
2016	0.581183969974518
2017	0.561119318008423
2018	0.509996652603149
2019	0.529517710208893
2020	0.599186837673187
2021	0.604154706001282
2022	0.601521968841553