Year	Number
1996	0.47480720281601
1998	0.435220897197723
2000	0.453906059265137
2002	0.436297506093979
2003	0.349641561508179
2004	0.364736646413803
2005	0.384340941905975
2006	0.309503465890884
2007	0.302739560604095
2008	0.303831338882446
2009	0.283778816461563
2010	0.273786127567291
2011	0.300698131322861
2012	0.246398240327835
2013	0.252466678619385
2014	0.212399378418922
2015	0.21929794549942
2016	0.223960906267166
2017	0.233241319656372
2018	0.23016220331192
2019	0.250075668096542
2020	0.247393816709518
2021	0.248921230435371
2022	0.248592063784599