Year	Number
2004	6251
2005	8060
2006	8400
2007	9876
2008	9579
2009	8418
2010	10218
2011	12108
2012	13209
2013	16796
2014	17873
2015	17784
2016	18398
2017	17325
2018	19692
2019	19533
2020	18529
2021	21964