Year	Number
1996	7
1998	7
2000	8
2002	9
2003	10
2004	13
2005	14
2006	15
2007	15
2008	15
2009	16
2010	16
2011	16
2012	16
2013	16
2014	14
2015	14
2016	14
2017	14
2018	14
2019	13
2020	12
2021	12
2022	12