Year	Number
1996	-0.756698846817017
1998	-0.942441284656525
2000	-0.628624498844147
2002	-1.25585794448853
2003	-1.31542313098907
2004	-1.98454308509827
2005	-1.80439794063568
2006	-1.39154350757599
2007	-1.31972801685333
2008	-1.38310325145721
2009	-0.957430124282837
2010	-0.940315425395966
2011	-0.990167558193207
2012	-0.78809267282486
2013	-0.631015360355377
2014	-0.643627285957336
2015	-0.671565055847168
2016	-0.745547473430634
2017	-0.676077306270599
2018	-0.640176177024841
2019	-0.887624740600586
2020	-1.02747869491577
2021	-1.12809944152832
2022	-1.4062956571579