Year	Number of
1980	41
1981	39
1982	37
1983	48
1984	55
1985	21
1986	34
1987	25
1988	32
1989	28
1990	13
1991	25
1992	26
1994	24
1995	11
1996	35
1997	22
1998	20
1999	16
2000	9
2001	15
2002	17
2003	15
2004	15
2005	14
2006	15
2007	19
2008	21
2009	10
2010	9
2011	7
2012	11
2013	9
2014	6
2015	14
2016	3
2017	11
2018	5
2019	6
2020	8