Year	Number
1996	-0.5208500623703
1998	-0.490328997373581
2000	-0.62007862329483
2002	-0.756493151187897
2003	-0.705886006355286
2004	-0.666135549545288
2005	-0.709110260009766
2006	-0.655459582805634
2007	-0.529211044311523
2008	-0.624475121498108
2009	-0.664479374885559
2010	-0.582948446273804
2011	-0.578526675701141
2012	-0.540134847164154
2013	-0.477090716362
2014	-0.35801687836647
2015	-0.393306106328964
2016	-0.401780694723129
2017	-0.390950411558151
2018	-0.493594706058502
2019	-0.441803723573685
2020	-0.398768901824951
2021	-0.324745863676071
2022	-0.300569444894791