Year	Number
2004	18481
2005	20533
2006	24402
2007	19534
2008	19892
2009	21035
2010	22681
2011	46697
2012	46476
2013	50717
2014	34183
2015	41092
2016	40680
2017	64192
2018	57280
2019	60485
2020	52736