Year	Number
2004	8421
2005	8789
2006	9231
2007	9033
2008	10186
2009	12437
2011	14003
2012	15323
2013	15708
2014	20576
2015	23544
2016	27017
2017	30632
2018	30543
2019	32741
2020	36448
2021	43233