Year	Number
1990	28
1991	27
1992	25
1993	23
1994	21
1995	21
1996	20
1997	19
1998	18
1999	18
2000	17
2001	17
2002	17
2003	17
2004	25
2005	19
2006	19
2007	21
2008	22
2009	24
2010	25
2011	25
2012	24
2013	24
2014	21
2015	20
2016	19
2017	18
2018	15
2019	14
2020	13
2021	11
2022	10