Year	number
2006	3973
2007	3181
2008	3246
2009	2271
2010	2717
2011	3174
2012	3733
2013	3660
2014	4409
2015	5083
2016	6437
2017	9350
2018	12560
2019	15956
2020	19817
2021	25433
2022	26901