Year	Number
1990	3
1991	3
1992	3
1993	3
1994	2
1995	2
1996	2
1997	2
1998	2
1999	2
2000	2
2001	2
2002	2
2003	2
2004	2
2005	2
2006	2
2007	2
2008	2
2009	2
2010	2
2011	1
2012	1
2013	1
2014	1
2015	1
2016	1
2017	8
2018	1
2019	0
2020	0
2021	0
2022	0