Year	Number
1996	0.187617555260658
1998	0.302315533161163
2000	0.331546425819397
2002	0.295856952667236
2003	0.361106097698212
2004	0.410197407007217
2005	0.30711555480957
2006	0.435252577066422
2007	0.469166576862335
2008	0.451515167951584
2009	0.372346967458725
2010	0.38138610124588
2011	0.381055623292923
2012	0.354334503412247
2013	0.341329365968704
2014	0.371715426445007
2015	0.373842895030975
2016	0.367286503314972
2017	0.445859044790268
2018	0.456688791513443
2019	0.461858510971069
2020	0.433770954608917
2021	0.423158824443817
2022	0.400206208229065