Year	number
2006	10247
2007	13948
2008	14091
2009	12254
2010	12391
2011	12744
2012	12506
2013	12441
2014	11965
2015	12625
2016	13584
2017	13848
2018	15829
2019	19592
2020	21333
2021	23109
2022	20896