Year	Number
2004	-0.250530570745468
2005	-0.259431391954422
2006	-0.412535488605499
2007	-0.41124302148819
2008	-0.282920986413956
2009	-0.321546137332916
2010	-0.267223596572876
2011	-0.213237464427948
2012	-0.189505279064178
2013	-0.182462155818939
2014	-0.516631662845612
2015	-0.819739103317261
2016	-0.955816030502319
2017	-0.966169059276581
2018	-0.461503237485886
2019	-0.517501175403595
2020	-0.382833212614059
2021	-0.550469279289246
2022	-0.536280393600464