Year	number
2006	11375
2007	12080
2008	9083
2009	7264
2010	12033
2011	16948
2012	15805
2013	15421
2014	14071
2015	12619
2016	10379
2017	9416
2018	9939
2019	9637
2020	8261
2021	8532
2022	7929