Year	Number
1996	-1.03471982479095
1998	-2.14244866371155
2000	-1.64359843730927
2002	-0.512546002864838
2003	-0.582542061805725
2004	-0.507584154605865
2005	-0.762413561344147
2006	-0.53756844997406
2007	-0.591357946395874
2008	-0.542712986469269
2009	-0.477358549833298
2010	-0.421741664409637
2011	-0.282882064580917
2012	-0.217299461364746
2013	-0.0756380930542946
2014	0.184110775589943
2015	0.234833031892776
2016	0.133281603455544
2017	0.083367332816124
2018	0.00522133428603411
2019	-0.0780941098928452
2020	-0.170778825879097
2021	-0.085266187787056
2022	-0.172904297709465