Year	Number
1996	-0.687850117683411
1998	-0.554986298084259
2000	-0.556626617908478
2002	-0.48723691701889
2003	-0.499147057533264
2004	-0.610386073589325
2005	-0.438366830348969
2006	-0.451205492019653
2007	-0.424296855926514
2008	-0.53019917011261
2009	-0.627837359905243
2010	-0.620883345603943
2011	-0.660571336746216
2012	-0.70156067609787
2013	-0.712197959423065
2014	-0.656892597675323
2015	-0.652822732925415
2016	-0.606329381465912
2017	-0.682943880558014
2018	-0.779425084590912
2019	-0.85467791557312
2020	-0.738110244274139
2021	-0.646397411823273
2022	-0.42673471570015