Year	Number
1996	6
1998	6
2000	7
2002	9
2003	9
2004	10
2005	10
2006	12
2007	12
2008	12
2009	12
2010	12
2011	13
2012	14
2013	14
2014	13
2015	13
2016	12
2017	10
2018	10
2019	10
2020	8
2021	9
2022	9