Year	Number
1996	4
1998	4
2000	4
2002	5
2003	8
2004	11
2005	12
2006	15
2007	15
2008	15
2009	15
2010	15
2011	16
2012	16
2013	16
2014	15
2015	15
2016	15
2017	15
2018	15
2019	15
2020	14
2021	13
2022	13