Year	Number
1996	-0.0396595969796181
1998	-0.0518919378519058
2000	-0.0965756773948669
2002	-0.348653823137283
2003	-0.107248865067959
2004	-0.26943427324295
2005	-0.343224316835403
2006	-0.391614824533463
2007	-0.625909268856049
2008	-0.758877277374268
2009	-0.31480073928833
2010	-0.209301576018333
2011	-0.43671789765358
2012	-0.445701062679291
2013	-0.400905102491379
2014	-0.383387714624405
2015	-0.526341378688812
2016	-0.361717164516449
2017	-0.43559205532074
2018	-0.5036341547966
2019	-0.504966557025909
2020	-0.474753051996231
2021	-0.511383533477783
2022	-0.552935242652893