Year	Number
1996	-2.43946290016174
1998	-1.75555086135864
2000	-1.95288050174713
2002	-2.18961954116821
2003	-2.15939283370972
2004	-1.36538577079773
2005	-1.35790872573853
2006	-1.32684123516083
2007	-1.24483954906464
2008	-1.28312230110168
2009	-1.05055463314056
2010	-0.468525290489197
2011	-0.427370250225067
2012	-0.484476506710052
2013	-0.475507080554962
2014	-0.615449607372284
2015	-0.817833304405212
2016	-0.441768199205399
2017	-0.32053479552269
2018	-0.203764617443085
2019	-0.339135408401489
2020	-0.314182639122009
2021	-0.286361515522003
2022	-0.291599869728088