Year	Number of
1980	2687
1981	2837
1982	2652
1983	2190
1984	2149
1985	1956
1986	1893
1987	1772
1988	1588
1989	1648
1990	1577
1991	1462
1992	1335
1993	1503
1994	1521
1995	1380
1996	1348
1997	1263
1998	1203
1999	1124
2000	1278
2001	1321
2002	1211
2003	1064
2004	1128
2005	1076
2006	1043
2007	955
2008	939
2009	918
2010	1001
2011	963
2012	909
2013	906
2014	886
2015	928
2016	986
2017	916
2018	913
2019	895
2020	778