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