Year	number
2006	3421
2007	4332
2008	5264
2009	5502
2010	6221
2011	7351
2012	9111
2013	9864
2014	10972
2015	11933
2016	11589
2017	12396
2018	13817
2019	17077
2020	15897
2021	22382
2022	23297