Year	Number
2004	12037
2005	12915
2006	21486
2007	23762
2008	23083
2009	23089
2010	24764
2011	23901
2012	20624
2013	22614
2014	25883
2015	24607
2016	24750
2017	27340
2018	29087
2019	30251
2020	30047
2021	32344