Year	Number
2004	21708
2006	28887
2007	30302
2008	31415
2009	27623
2010	32763
2011	38745
2012	41648
2013	43455
2014	46604
2015	47511
2016	44651
2017	46985
2018	52867
2019	47713
2020	40316
2021	45546