Year	Number
1996	1.10043299198151
1998	1.1276113986969
2000	1.11232662200928
2002	1.01157546043396
2003	0.963035404682159
2004	0.871200382709503
2005	0.976367771625519
2006	1.14037656784058
2007	1.12200117111206
2008	1.15002512931824
2009	0.857001900672913
2010	0.838140785694122
2011	0.719682574272156
2012	0.685145795345306
2013	0.680240392684937
2014	0.776729643344879
2015	0.403735220432281
2016	0.410313665866852
2017	0.492237210273743
2018	0.472064346075058
2019	0.468620896339417
2020	0.49604406952858
2021	0.501065075397491
2022	0.442538172006607