Year	number
2006	13499
2007	16004
2008	17603
2009	15805
2010	17519
2011	19003
2012	19950
2013	26749
2014	12884
2015	12445
2016	18072
2017	19813
2018	19723
2019	20566
2020	18969
2021	19255
2022	20035