Year	Number
1996	4
1998	5
2000	6
2002	7
2003	7
2004	9
2005	10
2006	12
2007	12
2008	12
2009	12
2010	13
2011	14
2012	14
2013	15
2014	14
2015	14
2016	13
2017	13
2018	13
2019	13
2020	12
2021	13
2022	13