Year	Number
1996	3
1998	3
2000	3
2002	4
2003	5
2004	7
2005	8
2006	9
2007	9
2008	9
2009	10
2010	10
2011	10
2012	10
2013	10
2014	10
2015	10
2016	10
2017	10
2018	10
2019	10
2020	9
2021	10
2022	10