Year	Number
2004	0.449361145496368
2005	0.382686883211136
2006	0.384345442056656
2007	-0.233671769499779
2008	-0.52124160528183
2009	-0.653987109661102
2010	-0.754009664058685
2011	-0.911160230636597
2012	-0.952287197113037
2013	-0.944317877292633
2014	-1.05382931232452
2015	-0.998972117900848
2016	-0.959161698818207
2017	-1.00315427780151
2018	-0.923807919025421
2019	-0.902161478996277
2020	-0.891345798969269
2021	-0.711252927780151
2022	-0.561271905899048