Year	Number
2006	3874
2007	5579
2008	4854
2009	3045
2010	3052
2011	2649
2012	2515
2013	4191
2014	2670
2015	3127
2016	3431
2017	3079
2018	3530
2019	3194
2020	4108
2021	3833