Year	Number
1996	-0.891484022140503
1998	-0.881181359291077
2000	-0.900468170642853
2002	-0.977119624614716
2003	-1.11956787109375
2004	-1.20109069347382
2005	-1.31778132915497
2006	-1.27037906646729
2007	-1.26575326919556
2008	-1.19405424594879
2009	-1.25794959068298
2010	-1.162961602211
2011	-1.19733154773712
2012	-1.07314610481262
2013	-1.16939079761505
2014	-1.38923585414886
2015	-1.44318914413452
2016	-1.41679394245148
2017	-1.50068795681
2018	-1.39432609081268
2019	-1.38387441635132
2020	-1.50229716300964
2021	-1.50971448421478
2022	-1.47418415546417