Year	Number
1996	-0.713683128356934
1998	-0.886453092098236
2000	-0.755833327770233
2002	-0.787837088108063
2003	-0.822545170783997
2004	-0.656644761562347
2005	-0.91963791847229
2006	-1.15948677062988
2007	-1.06266069412231
2008	-1.07074284553528
2009	-1.07403683662415
2010	-1.04480218887329
2011	-1.06049060821533
2012	-1.02166974544525
2013	-1.03864192962646
2014	-1.09070551395416
2015	-1.06144654750824
2016	-1.05430674552917
2017	-1.06162405014038
2018	-1.03981590270996
2019	-1.15397369861603
2020	-1.14465916156769
2021	-1.1918785572052
2022	-1.147820353508