Year	Number
1996	-1.22494494915009
1998	-1.50108397006989
2000	-0.922982037067413
2002	-1.58716797828674
2003	-1.17022037506104
2004	-1.19059777259827
2005	-1.16583943367004
2006	-0.923411786556244
2007	-0.771577417850494
2008	-0.721322357654572
2009	-0.250487625598907
2010	-0.316415846347809
2011	-0.354300379753113
2012	-0.489689856767654
2013	-0.475050121545792
2014	-0.359291583299637
2015	-0.529127299785614
2016	-0.523459076881409
2017	-0.533614933490753
2018	-0.348402857780457
2019	-0.29930168390274
2020	-0.213065609335899
2021	-0.229479312896729
2022	-0.0169060137122869