Year	Number of
1980	42717
1981	11728
1982	9509
1983	8589
1984	10493
1985	8728
1986	8032
1987	10034
1988	9967
1989	12005
1990	9255
1991	14246
1992	14121
1993	20569
1994	13021
1995	15936
1996	14189
1997	12659
1998	11794
1999	12062
2000	11850
2001	11783
2002	11464
2003	10900
2004	10171
2005	9212
2006	9361
2007	9316
2008	9453
2009	10097
2010	10362
2011	10980
2012	11042
2013	11052
2014	10191
2015	10215
2016	9252
2017	9051
2018	8906
2019	8524
2020	5993