Year	Number
1996	-0.403521746397018
1998	-0.37104406952858
2000	-0.193513154983521
2002	-0.209681615233421
2003	-0.246573522686958
2004	-0.274371653795242
2005	-0.352792233228683
2006	-0.448409080505371
2007	-0.38940167427063
2008	-0.455655753612518
2009	-0.73262745141983
2010	-0.878425717353821
2011	-0.894967436790466
2012	-0.927833795547485
2013	-0.920528054237366
2014	-0.736539125442505
2015	-0.704786956310272
2016	-0.83280223608017
2017	-0.878510773181915
2018	-0.836624085903168
2019	-1.01327264308929
2020	-0.879376113414764
2021	-0.885180354118347
2022	-0.942355334758759