Year	Number
1996	-0.260978221893311
1998	-0.23320759832859
2000	-1.00785183906555
2002	-0.941148579120636
2003	-1.13449609279633
2004	-1.27960348129272
2005	-1.34959387779236
2006	-1.16377902030945
2007	-1.21891403198242
2008	-1.252720952034
2009	-1.12651801109314
2010	-1.29745149612427
2011	-1.18075549602509
2012	-1.10815095901489
2013	-0.937793016433716
2014	-0.85645455121994
2015	-0.746898710727692
2016	-0.735667884349823
2017	-0.812799036502838
2018	-0.647259414196014
2019	-0.559290289878845
2020	-0.539629280567169
2021	-0.537407279014587
2022	-0.342977225780487