Year	Number
2004	15090
2005	12361
2006	15211
2007	6500
2008	10801
2009	7540
2010	17806
2011	22161
2012	14806
2013	17220
2014	37586
2015	39144
2016	48786
2017	41091
2018	44916
2019	45477
2020	42254
2021	52878