Year	Number
1996	-0.718783438205719
1998	-1.06540274620056
2000	-1.05687987804413
2002	-0.571163654327393
2003	-0.590705573558807
2004	-0.561549425125122
2005	-0.743174850940704
2006	-0.903966546058655
2007	-0.856526553630829
2008	-0.868917524814606
2009	-0.790999948978424
2010	-0.965909421443939
2011	-1.21731686592102
2012	-1.31802463531494
2013	-1.31746447086334
2014	-1.31105923652649
2015	-1.31306099891663
2016	-1.37202835083008
2017	-1.38725745677948
2018	-1.41806530952454
2019	-1.42869198322296
2020	-1.4533017873764
2021	-1.49894762039185
2022	-1.41756176948547