Year	Number
2004	13030
2005	12758
2006	15390
2007	16034
2008	14445
2009	13936
2010	14051
2011	14665
2012	15876
2013	14436
2014	15650
2015	15769
2016	16577
2017	17099
2018	17806
2019	18081
2020	22625
2021	24096