Year	Number
2002	-1.23270869255066
2003	-1.26821637153625
2004	-1.14806532859802
2005	-1.14945936203003
2006	-1.55442380905151
2007	-1.63284885883331
2008	-1.34163308143616
2009	-1.15977454185486
2010	-1.11062812805176
2011	-1.05282890796661
2012	-1.02370250225067
2013	-0.991481781005859
2014	-0.905718266963959
2015	-0.993646323680878
2016	-0.993600726127625
2017	-0.746640622615814
2018	-0.792416214942932
2019	-0.775254309177399
2020	-0.763640761375427
2021	-0.777108013629913
2022	-0.472811251878738