Year	Number
1996	-0.475311696529388
1998	-0.354707360267639
2000	-0.685290277004242
2002	-0.831196308135986
2003	-0.936161398887634
2004	-0.957234144210815
2005	-0.96779453754425
2006	-1.03793919086456
2007	-0.861449539661407
2008	-0.854377806186676
2009	-0.738012194633484
2010	-0.674511253833771
2011	-0.527820348739624
2012	-0.474284678697586
2013	-0.447573006153107
2014	-0.384382158517838
2015	-0.394115418195724
2016	-0.383266448974609
2017	-0.352241843938828
2018	-0.317857921123505
2019	-0.367639988660812
2020	-0.47004047036171
2021	-0.240734726190567
2022	-0.308546245098114