Year	Number of
1980	17
1981	10
1982	17
1983	14
1984	20
1985	26
1986	13
1987	38
1988	17
1989	3
1991	6
1992	4
1993	25
1994	41
1995	19
1996	5
1997	15
1999	32
2002	11
2003	9
2004	5
2005	10
2006	12
2007	11
2009	19
2010	19
2011	12
2012	4
2013	8
2014	14
2015	14
2016	23
2017	20
2018	17
2019	6
2020	10