Year	Number
1996	-1.40605127811432
1998	-1.35108137130737
2000	-1.15839385986328
2002	-1.24116063117981
2003	-1.14207339286804
2004	-0.978848516941071
2005	-1.15841937065125
2006	-1.07245790958405
2007	-1.12784206867218
2008	-1.09022438526154
2009	-1.12183570861816
2010	-0.931619644165039
2011	-0.957298815250397
2012	-0.936370611190796
2013	-1.0658118724823
2014	-0.791394650936127
2015	-0.904887020587921
2016	-1.09165561199188
2017	-1.185950756073
2018	-1.16391563415527
2019	-1.11671459674835
2020	-0.759621620178223
2021	-0.646949529647827
2022	-0.756126046180725