Year	Number
1990	33
1991	32
1992	31
1993	30
1994	29
1995	28
1996	26
1997	25
1998	25
1999	25
2000	24
2001	24
2002	24
2003	25
2004	25
2005	25
2006	25
2007	25
2008	25
2009	24
2010	24
2011	23
2012	22
2013	22
2014	21
2015	20
2016	20
2017	20
2018	20
2019	20
2020	20
2021	21
2022	22