Year	Number
1980	16989
1981	13723
1982	11561
1983	10029
1984	8867
1985	7543
1986	6369
1987	5875
1988	5194
1989	4986
1990	4260
1991	3908
1992	3547
1993	3402
1994	3520
1995	3477
1996	3484
1997	3637
1998	3544
1999	3282
2000	3483
2001	3605
2002	3389
2003	3339
2004	3060
2005	2948
2006	2720
2007	2387
2008	1761
2009	1593
2010	1832
2011	2099
2012	2092
2013	2196
2014	2033
2015	1994
2016	2012
2017	1832
2018	1919
2019	1766
2020	1542
2021	1373