Year	Number
1996	-1.28321778774261
1998	-1.35281467437744
2000	-1.33589220046997
2002	-1.24433362483978
2003	-1.22688519954681
2004	-1.19656825065613
2005	-1.23887705802917
2006	-1.09356272220612
2007	-0.986280679702759
2008	-0.871392250061035
2009	-0.988199770450592
2010	-1.01070928573608
2011	-1.00837445259094
2012	-1.04977643489838
2013	-1.16872656345367
2014	-1.31728744506836
2015	-1.33540391921997
2016	-1.39232754707336
2017	-1.37082552909851
2018	-1.42432010173798
2019	-1.28655707836151
2020	-1.16232776641846
2021	-1.20103907585144
2022	-1.40625643730164