Year	Number
2002	-0.764728426933289
2003	-0.967885792255402
2004	-0.686259031295776
2005	-1.00036764144897
2006	-1.22270429134369
2007	-1.15335500240326
2008	-1.06599092483521
2009	-1.19305002689362
2010	-1.25159215927124
2011	-1.18563520908356
2012	-1.19557499885559
2013	-1.24591684341431
2014	-1.21361148357391
2015	-1.07980561256409
2016	-1.04011559486389
2017	-1.00352168083191
2018	-0.936158120632172
2019	-0.858102381229401
2020	-0.754795730113983
2021	-0.754948556423187
2022	-0.767780125141144