Year	Number
1989	8902
1990	8092
1991	7717
1992	9329
1993	9763
1994	15660
1995	17740
1996	16544
1997	18376
1998	19786
1999	21641
2000	25442
2001	22225
2002	23953
2003	14926
2004	12547
2005	13495
2006	13974
2007	18031
2008	12684
2009	10093
2010	10228
2011	12066
2012	12110
2013	10440
2014	13965
2015	11173
2016	9917
2017	6694
2018	5661
2019	7480
2020	4877
2021	3549