Year	number
2006	3450
2007	6187
2008	5503
2009	5884
2010	7269
2011	9246
2012	11031
2013	14729
2014	19972
2015	22387
2016	23944
2017	27442
2018	29243
2019	30733
2020	33411
2021	37275
2022	37312