Year	Number
2009	0.483979135751724
2010	0.485836625099182
2011	0.48952779173851
2012	0.4273621737957
2013	0.412048131227493
2014	0.445551186800003
2015	0.448510438203812
2016	0.478675037622452
2017	0.475276798009872
2018	0.493930906057358
2019	0.477580606937408
2020	0.489355653524399
2021	0.526650130748749
2022	0.501705467700958