Year Number 2004 -1.11532366275787 2005 -0.639274537563324 2006 -1.00409436225891 2007 -1.08446216583252 2008 -1.00724422931671 2009 -1.144207239151 2010 -1.02263641357422 2011 -0.908538818359375 2012 -0.813310861587524 2013 -0.833626627922058 2014 -1.12227737903595 2015 -0.995667695999146 2016 -0.927770733833313 2017 -0.928836345672607 2018 -0.900794625282288 2019 -0.88116580247879 2020 -0.692087948322296 2021 -0.833722710609436 2022 -0.674787521362305