Year	Number
1996	6
1998	7
2000	8
2002	8
2003	9
2004	10
2005	10
2006	12
2007	12
2008	12
2009	12
2010	14
2011	15
2012	15
2013	14
2014	14
2015	14
2016	13
2017	13
2018	13
2019	13
2020	12
2021	12
2022	12