Year	Number
1996	-0.186238184571266
1998	-0.166287750005722
2000	-0.3370121717453
2002	-0.341501384973526
2003	-0.308773815631866
2004	-0.38966566324234
2005	-0.286303788423538
2006	-0.444665193557739
2007	-0.378879934549332
2008	-0.35524570941925
2009	-0.480134069919586
2010	-0.486346453428268
2011	-0.514893710613251
2012	-0.537633419036865
2013	-0.477214455604553
2014	-0.400824993848801
2015	-0.395179778337479
2016	-0.394902527332306
2017	-0.469080984592438
2018	-0.572451293468475
2019	-0.573558688163757
2020	-0.616245627403259
2021	-0.556608736515045
2022	-0.443158507347107