Year	Number of
1980	1
1981	0
1982	0
1983	0
1984	0
1985	1
1986	2
1987	2
1988	1
1989	1
1990	1
1991	0
1992	1
1994	1
1995	1
1996	0
1997	0
1998	0
1999	3
2000	0
2001	0
2002	0
2010	1
2014	0
2015	0
2016	2
2017	0
2018	1
2019	0
2020	0