Year	Number
1996	9
1998	9
2000	11
2002	12
2003	12
2004	12
2005	12
2006	14
2007	14
2008	15
2009	15
2010	16
2011	16
2012	17
2013	16
2014	15
2015	15
2016	13
2017	13
2018	13
2019	13
2020	12
2021	12
2022	12