Year	Number
2004	10679
2005	11877
2006	13270
2007	14118
2008	13885
2009	12681
2010	15772
2011	16976
2012	18591
2013	19284
2014	19948
2015	24119
2016	24299
2017	23762
2018	25930
2019	28427
2020	31370
2021	33617