Year	Number
2004	0.410197407007217
2005	0.30711555480957
2006	0.435252577066422
2007	0.469166576862335
2008	0.451515167951584
2009	0.323029518127441
2010	0.335227936506271
2011	0.329279899597168
2012	0.313144892454147
2013	0.300637990236282
2014	0.350605726242065
2015	0.330853641033173
2016	0.3202865421772
2017	0.333829998970032
2018	0.330506831407547
2019	0.328059256076813
2020	0.357047557830811
2021	0.362440079450607
2022	0.361435800790787