Year	Number
1986	4
1987	3
1988	3
1989	3
1990	3
1991	3
1992	2
1993	2
1994	2
1995	2
1996	2
1997	2
1998	2
1999	2
2000	2
2001	1
2002	1
2003	1
2004	1
2005	1
2006	1
2007	1
2008	1
2009	1
2010	1
2011	1
2012	1
2013	1
2014	1
2015	0
2016	0
2017	0
2018	0
2019	0
2020	0
2021	0
2022	0