Year	Number
2004	14982
2005	16985
2006	20017
2007	17080
2008	16092
2009	16134
2010	18040
2011	19522
2012	20499
2013	20871
2014	20475
2015	21594
2016	22676
2017	22381
2018	22542
2019	21583
2020	22104
2021	25786