Year	number
2006	6368
2007	8997
2008	8297
2009	9138
2010	11556
2011	11540
2012	12308
2013	12323
2014	12367
2015	11850
2016	12176
2017	11781
2018	12977
2019	12368
2020	12263
2021	14130
2022	13615