Year	Number of
1980	33
1981	18
1982	12
1983	23
1984	9
1985	32
1986	27
1987	22
1988	24
1989	26
1990	23
1991	30
1992	30
1993	28
1994	19
1995	36
1998	18
1999	14
2000	16
2001	16
2002	13
2003	31
2005	12
2006	9
2007	18
2008	17
2009	18
2010	14
2011	12
2012	19
2013	18
2014	15
2015	20
2016	20
2017	23
2018	27
2019	30
2020	30