Year	Number
1996	0.53429514169693
1998	0.59451287984848
2000	0.413654536008835
2002	0.435027241706848
2003	0.234208837151527
2004	0.036098800599575
2005	-0.00782428868114948
2006	-0.226843059062958
2007	-0.151492446660995
2008	-0.225084587931633
2009	-0.207649528980255
2010	-0.198580101132393
2011	-0.179331794381142
2012	-0.166715115308762
2013	-0.20437516272068
2014	-0.106046512722969
2015	-0.155741572380066
2016	-0.210172936320305
2017	-0.132191523909569
2018	-0.169320344924927
2019	-0.170178100466728
2020	-0.171098560094833
2021	-0.157717898488045
2022	-0.167874693870544