Year	Number
1978	20036
1979	19815
1998	19710
1999	19710
2000	19466
2001	19044
2005	16158
2006	13613
2008	10224
2009	7663
2010	6546
2011	6095
2012	5258
2013	5860
2015	6580
2016	6670
2017	6532
2018	5539
2020	3993
2021	3466
2022	3965