Year	Number
1996	-1.37655365467072
1998	-1.7480480670929
2000	-1.76828348636627
2002	-1.66708242893219
2003	-1.74426674842834
2004	-1.84140944480896
2005	-1.78907322883606
2006	-2.08757138252258
2007	-2.0094952583313
2008	-1.95910382270813
2009	-1.9673525094986
2010	-2.06142497062683
2011	-2.05092811584473
2012	-2.11408996582031
2013	-2.13228559494019
2014	-2.09784650802612
2015	-2.10210704803467
2016	-2.11545777320862
2017	-1.99863505363464
2018	-2.00086236000061
2019	-2.02918887138367
2020	-2.05459833145142
2021	-2.0308940410614
2022	-2.06706070899963