Year	Number
1996	0.268791258335114
1998	0.262724310159683
2000	0.207037776708603
2002	-0.199828878045082
2003	-0.218190565705299
2004	-0.231533601880074
2005	-0.533665299415588
2006	-0.510794937610626
2007	-0.45739883184433
2008	-0.494799554347992
2009	-0.69857132434845
2010	-0.683138370513916
2011	-0.669470012187958
2012	-0.74639219045639
2013	-0.77031546831131
2014	-0.790833830833435
2015	-0.774814009666443
2016	-0.687102138996124
2017	-0.726939260959625
2018	-0.713534414768219
2019	-0.692302823066711
2020	-0.705098152160645
2021	-0.72774875164032
2022	-0.614071309566498