Year	Number
2001	14000
2002	19935
2003	17205
2004	19729
2005	17048
2006	19664
2007	19971
2008	19568
2009	17208
2010	16893
2011	17303
2012	16841
2013	18156
2014	28944
2015	31304
2016	31958
2017	29705
2018	28160
2019	30964
2020	12773
2021	17412