Year	Number
1996	20230
1997	16454
2000	3270
2001	3810
2009	1102
2010	931
2011	1530
2012	2924
2013	3638
2014	3427
2015	4295
2016	5995
2017	7920
2018	9634
2019	12858
2020	15792
2021	17540