Year	Number
1996	5
1998	6
2000	7
2002	8
2003	7
2004	7
2005	8
2006	9
2007	9
2008	9
2009	13
2010	13
2011	12
2012	12
2013	12
2014	11
2015	10
2016	9
2017	9
2018	9
2019	9
2020	8
2021	8
2022	8