Year	Number
1996	-1.16929292678833
1998	-1.10427415370941
2000	-1.15075349807739
2002	-1.2652895450592
2003	-1.18989634513855
2004	-1.06095468997955
2005	-1.27624380588531
2006	-1.24366450309753
2007	-1.32703351974487
2008	-1.22405958175659
2009	-1.21725904941559
2010	-1.23575270175934
2011	-1.20567786693573
2012	-1.17489755153656
2013	-1.15869379043579
2014	-1.13005948066711
2015	-1.07031738758087
2016	-1.1337902545929
2017	-1.24543416500092
2018	-1.2001781463623
2019	-1.13162696361542
2020	-1.25432980060577
2021	-1.32001793384552
2022	-1.36932182312012