Year	Number
1996	-1.02149343490601
1998	-1.06873393058777
2000	-1.07713758945465
2002	-1.05427289009094
2003	-1.01513183116913
2004	-1.27052068710327
2005	-1.3477623462677
2006	-1.39920389652252
2007	-1.40573811531067
2008	-1.39833152294159
2009	-1.43222260475159
2010	-1.43577635288239
2011	-1.44598138332367
2012	-1.31468987464905
2013	-1.28536176681519
2014	-1.17711114883423
2015	-1.22505533695221
2016	-1.39458119869232
2017	-1.36799919605255
2018	-1.38221168518066
2019	-1.39357078075409
2020	-1.43377959728241
2021	-1.43906712532043
2022	-1.43677389621735