Year	Number
2004	16748
2005	19754
2006	19428
2007	17890
2008	23303
2009	18410
2010	19454
2011	20148
2012	15772
2013	15004
2014	14352
2015	14070
2016	15319
2017	15053
2018	16220
2019	15304
2020	14087
2021	15713