Year	number
2006	20989
2007	23256
2008	23134
2009	20260
2010	23547
2011	24829
2012	22318
2013	19241
2014	24125
2015	22148
2016	28707
2017	25233
2018	25728
2019	29247
2020	32380
2021	36842
2022	47171