Year	Number
2004	10554
2005	12148
2006	12776
2007	13415
2008	13472
2009	11353
2010	12875
2011	15493
2012	17455
2013	18216
2014	18144
2015	18997
2016	20411
2017	21915
2018	45446
2019	34033
2020	30311
2021	34688