Year	Number
2002	50
2003	145
2004	154
2005	384
2006	1715
2007	6732
2008	10266
2009	11947
2010	13705
2011	14063
2012	14328
2013	12962
2014	5408
2015	9354
2016	12384
2017	12361
2018	13818
2019	12015
2020	13979
2021	16291