Year	Number
1996	-1.1288206577301
1998	-1.13465404510498
2000	-1.08041477203369
2002	-0.96473890542984
2003	-0.91487193107605
2004	-1.06881201267242
2005	-1.22963762283325
2006	-1.01633596420288
2007	-1.03378558158875
2008	-1.06285727024078
2009	-1.27607345581055
2010	-1.30798542499542
2011	-1.38756489753723
2012	-1.31068003177643
2013	-1.2730427980423
2014	-1.1944442987442
2015	-1.28529608249664
2016	-1.19976401329041
2017	-1.18751633167267
2018	-1.08239960670471
2019	-1.04689145088196
2020	-1.07281696796417
2021	-0.829331040382385
2022	-0.757623434066772