Year	Number
1996	-1.50076675415039
1998	-1.33447062969208
2000	-1.361532330513
2002	-1.30302631855011
2003	-1.47258913516998
2004	-1.64990055561066
2005	-1.54068303108215
2006	-1.65977263450623
2007	-1.62557423114777
2008	-1.61574602127075
2009	-1.65966737270355
2010	-1.67280876636505
2011	-1.59468901157379
2012	-1.06979167461395
2013	-1.00605630874634
2014	-0.883994281291962
2015	-0.853787243366241
2016	-0.641805827617645
2017	-0.590761244297028
2018	-0.612783849239349
2019	-0.645230770111084
2020	-0.680532872676849
2021	-1.04807686805725
2022	-1.15162312984467