Year	Number
1996	-0.411945343017578
1998	-0.408505082130432
2000	-0.428554445505142
2002	-0.508570909500122
2003	-0.0487161204218864
2004	-0.915191173553467
2005	-0.286168545484543
2006	-0.577596843242645
2007	-0.709744989871979
2008	-0.765467464923859
2009	-1.07183527946472
2010	-1.15894365310669
2011	-1.15420484542847
2012	-1.09300851821899
2013	-1.08675539493561
2014	-1.01474559307098
2015	-0.73503041267395
2016	-0.691017687320709
2017	-0.339257925748825
2018	-0.376959830522537
2019	-0.359623849391937
2020	-0.330750852823257
2021	-0.405656158924103
2022	-0.381970435380936