Year	Number
1996	-1.40964531898499
1998	-1.54519212245941
2000	-1.60816824436188
2002	-1.62898147106171
2003	-1.33037447929382
2004	-1.1239367723465
2005	-1.34393203258514
2006	-1.1003794670105
2007	-1.15243637561798
2008	-1.15404140949249
2009	-1.19393682479858
2010	-1.20814538002014
2011	-1.18952429294586
2012	-1.22011303901672
2013	-1.21832025051117
2014	-1.24709331989288
2015	-1.28274750709534
2016	-1.22429025173187
2017	-1.22121274471283
2018	-1.19094169139862
2019	-1.17459666728973
2020	-1.06286656856537
2021	-1.15069496631622
2022	-1.16025280952454