Year	Number
1996	-0.266652703285217
1998	-0.267708390951157
2000	-0.324955195188522
2002	-0.582765877246857
2003	-0.392048835754395
2004	-0.346228837966919
2005	-0.183769479393959
2006	-0.258387207984924
2007	-0.233363419771194
2008	-0.21839340031147
2009	-0.298093944787979
2010	-0.320954978466034
2011	-0.259136259555817
2012	-0.28433284163475
2013	-0.331608176231384
2014	-0.331334412097931
2015	-0.354117453098297
2016	-0.314001739025116
2017	-0.179300889372826
2018	-0.22858552634716
2019	-0.304319977760315
2020	-0.202643379569054
2021	-0.332243531942368
2022	-0.418417632579803