Year	Number
1980	7
1981	6
1982	3
1983	4
1986	5
1987	5
1988	3
1989	2
1990	2
1991	6
1992	3
1993	8
1994	21
1995	11
1996	6
1997	22
1998	8
1999	11
2000	23
2001	26
2002	22
2007	10
2008	14
2009	8
2010	12
2011	9
2012	11
2013	13
2014	5
2015	9
2016	3
2017	5
2018	2
2019	5
2020	6
2021	5