Year	Number
2004	26418
2005	19777
2006	24089
2007	18148
2008	21887
2009	14611
2010	22482
2011	35778
2012	28845
2013	32996
2014	47684
2015	54367
2016	69563
2017	58207
2018	64891
2019	63540
2020	52435