Year	Number
1996	9
1998	9
2000	9
2002	10
2003	11
2004	12
2005	12
2006	15
2007	15
2008	15
2009	17
2010	17
2011	18
2012	18
2013	17
2014	15
2015	15
2016	14
2017	14
2018	14
2019	14
2020	13
2021	12
2022	12