Year	Number
2004	0.347725838422775
2005	0.365848004817963
2006	0.406286180019379
2007	0.38243693113327
2008	0.357337206602097
2009	0.398354142904282
2010	0.411506086587906
2011	0.412089228630066
2012	0.398291945457459
2013	0.386693984270096
2014	0.517064273357391
2015	0.498630166053772
2016	0.51005220413208
2017	0.480442553758621
2018	0.480384886264801
2019	0.491095125675201
2020	0.52329158782959
2021	0.495514720678329
2022	0.458686977624893