Year	Number
2007	17477
2008	17469
2009	17449
2010	17314
2011	18648
2012	18511
2013	19014
2014	18126
2015	18318
2016	18771
2017	18829
2018	18664
2019	18754
2020	18851
2021	18501
2022	18616