Year	Number of
1980	64
1981	49
1982	45
1983	50
1984	54
1985	49
1986	35
1987	24
1988	14
1989	36
1990	23
1991	20
1992	29
1993	33
1994	23
1995	20
1996	22
1997	21
1998	30
1999	22
2000	24
2001	12
2002	29
2003	16
2004	12
2005	18
2006	18
2007	23
2008	13
2009	8
2010	11
2011	9
2012	11
2013	10
2014	13
2015	14
2016	8
2017	11
2018	9
2019	10
2020	8