Year	Number
1996	7
1998	7
2000	8
2002	10
2003	10
2004	12
2005	13
2006	16
2007	17
2008	18
2009	18
2010	18
2011	19
2012	19
2013	18
2014	15
2015	15
2016	15
2017	15
2018	15
2019	14
2020	13
2021	12
2022	12