Year	Number
1980	6
1982	63
1983	16
1984	4
1985	12
1987	12
1990	6
1995	7
1996	10
1998	11
1999	8
2000	4
2001	7
2002	7
2011	2
2012	8
2013	6
2015	4
2016	10
2017	4
2018	8