Year	number
2006	13325
2007	12285
2008	13470
2009	11435
2010	11714
2011	17495
2012	18515
2013	20231
2014	21066
2015	21453
2016	22412
2017	24379
2018	20092
2019	21835
2020	15161
2021	15396
2022	25421