Year	Number
1996	0.187617555260658
1998	0.302315533161163
2000	0.331546425819397
2002	0.295856952667236
2003	0.361106097698212
2004	0.376263976097107
2005	0.23687019944191
2006	0.271946340799332
2007	0.287964910268784
2008	0.277931034564972
2009	0.242289945483208
2010	0.235913410782814
2011	0.241185411810875
2012	0.241578862071037
2013	0.214394152164459
2014	0.226310148835182
2015	0.239235520362854
2016	0.230802997946739
2017	0.248026371002197
2018	0.275864094495773
2019	0.27733850479126
2020	0.298296719789505
2021	0.294451177120209
2022	0.285043686628342