Year	Number
2004	16849
2005	17368
2006	19390
2007	20904
2008	21505
2009	16380
2010	15812
2011	15546
2012	14663
2013	10411
2014	4640
2015	3832
2016	3980
2017	3951
2018	4432
2019	3953
2020	3384
2021	3973