Year	Number
1996	-0.988058924674988
1998	-0.809740364551544
2000	-0.294286817312241
2002	-0.0953808054327965
2003	0.120704226195812
2004	0.355680614709854
2005	0.448557078838348
2006	0.358128875494003
2007	0.747057616710663
2008	0.808881163597107
2009	0.831896722316742
2010	0.0280884467065334
2011	-1.28737926483154
2012	-1.5869597196579
2013	-1.84407651424408
2014	-2.35340714454651
2015	-2.18965125083923
2016	-2.27473783493042
2017	-2.35357475280762
2018	-2.43496870994568
2019	-2.56577134132385
2020	-2.46227836608887
2021	-2.30834579467773
2022	-2.19796347618103