Year	Number
2004	8844
2005	10850
2006	11778
2007	17921
2008	13875
2009	10487
2010	12509
2011	13962
2012	14105
2013	15199
2014	14943
2015	15326
2016	15112
2017	15337
2018	15820
2019	15788
2020	14219
2021	14077