Year	Number
1980	10
1981	19
1982	8
1985	5
1986	21
1987	5
1988	14
1989	11
1990	3
1991	8
1992	12
1993	4
1994	12
1995	4
1996	19
1997	12
1998	12
2008	22
2011	19
2012	14
2013	18
2014	18
2015	20
2016	36
2017	18
2018	13
2019	23
2020	19
2021	14