Year	number
2006	13199
2007	12335
2008	10568
2009	8111
2010	9447
2011	11446
2012	11271
2013	12803
2014	12931
2015	11027
2016	9994
2017	12323
2018	11544
2019	12120
2020	11605
2021	13860
2022	15488