Year	Number
2004	21899
2005	24102
2006	29399
2007	23218
2008	22066
2009	14648
2010	14424
2011	13476
2012	13416
2013	12540
2014	13500
2015	13632
2016	14243
2017	13438
2018	13107
2019	12303
2020	10791
2021	10906