Year	Number
2004	20239
2005	22219
2006	24620
2007	28606
2008	27695
2009	22660
2010	25529
2011	29190
2012	29819
2013	34092
2014	38814
2015	40744
2016	42875
2017	43160
2018	46419
2019	47219
2020	44204
2021	57324