Year	Number
1996	-1.95664024353027
1998	-1.94254302978516
2000	-2.01298880577087
2002	-2.05034351348877
2003	-1.50118041038513
2004	-1.64300525188446
2005	-1.30099940299988
2006	-1.28219759464264
2007	-1.12617206573486
2008	-1.10468685626984
2009	-1.02345550060272
2010	-0.991843640804291
2011	-1.06950151920319
2012	-1.07618057727814
2013	-1.05719232559204
2014	-1.14425325393677
2015	-1.1279354095459
2016	-1.01554954051971
2017	-1.04724383354187
2018	-0.999588847160339
2019	-0.964265942573547
2020	-1.007279753685
2021	-0.963002920150757
2022	-0.948201417922974