Year	Number
1983	15
1985	16
1986	16
1990	24
1991	17
1992	23
1993	29
1994	31
1995	25
1996	25
1997	23
1998	22
1999	21
2000	23
2001	25
2002	23
2003	22
2004	22
2005	20
2006	18
2007	12
2008	11
2009	9
2010	9
2011	9
2012	9
2013	9
2014	9
2015	10
2016	10
2017	10
2018	10
2019	10
2020	10
2021	10
2022	9