Year	Number
2004	0.410197407007217
2005	0.265190988779068
2006	0.31173050403595
2007	0.326607048511505
2008	0.326600551605225
2009	0.300981521606445
2010	0.288806110620499
2011	0.299673110246658
2012	0.299872100353241
2013	0.293751776218414
2014	0.353842169046402
2015	0.338430404663086
2016	0.335610568523407
2017	0.331072449684143
2018	0.365629911422729
2019	0.371362656354904
2020	0.398686468601227
2021	0.422974407672882
2022	0.400206208229065