Year	Number
2004	-0.423489183187485
2005	-0.457559108734131
2006	-0.468085944652557
2007	-0.660639941692352
2008	-0.69921886920929
2009	-0.80252867937088
2010	-0.880354702472687
2011	-0.783309817314148
2012	-0.799028694629669
2013	-0.772437751293182
2014	-0.566529631614685
2015	-0.379997193813324
2016	-0.299741595983505
2017	-0.0621311701834202
2018	-0.0640199407935143
2019	-0.0515526756644249
2020	0.135919511318207
2021	0.0944074466824532
2022	0.167575597763062