Year	Number
2004	5171
2005	3765
2006	4809
2007	4952
2008	4686
2009	3297
2011	4475
2012	4342
2013	5114
2014	4691
2015	4512
2016	9109
2017	7793
2018	7438
2019	5591
2020	4130
2021	8079