Year	Number
1980	15
1981	8
1982	7
1983	16
1984	15
1985	14
1986	11
1987	3
1988	9
1989	6
1990	15
1991	19
1992	18
1993	20
1994	11
1995	16
1996	31
2000	7
2011	21
2013	9
2014	13
2015	14
2016	68
2017	33
2018	135
2019	34
2020	22
2021	35