Year	Number
1996	-0.681765139102936
1998	-0.777622282505035
2000	-0.801567316055298
2002	-1.16135859489441
2003	-0.892346799373627
2004	-0.965285062789917
2005	-1.04973876476288
2006	-1.18712043762207
2007	-1.11243689060211
2008	-1.2209724187851
2009	-1.27136433124542
2010	-1.3312314748764
2011	-1.39367055892944
2012	-1.35484611988068
2013	-1.33361232280731
2014	-1.3010036945343
2015	-1.52344965934753
2016	-1.69016528129578
2017	-1.69105064868927
2018	-1.7597644329071
2019	-1.78008759021759
2020	-1.76403212547302
2021	-1.68093037605286
2022	-1.61861562728882