Year	Number
1996	-1.57816350460052
1998	-1.41187870502472
2000	-1.45806467533112
2002	-1.23877906799316
2003	-1.27261531352997
2004	-1.28547978401184
2005	-1.23471939563751
2006	-1.25208795070648
2007	-1.18531394004822
2008	-1.11934685707092
2009	-1.12613534927368
2010	-1.12052512168884
2011	-1.12547838687897
2012	-1.07624673843384
2013	-1.1138436794281
2014	-1.14523017406464
2015	-1.17708706855774
2016	-1.14029264450073
2017	-1.09452450275421
2018	-0.903365194797516
2019	-0.793237388134003
2020	-0.81600284576416
2021	-0.854894280433655
2022	-0.7971311211586