Year	Number
1996	2
1998	2
2000	2
2002	2
2003	2
2004	3
2005	3
2006	3
2007	3
2008	3
2009	4
2010	4
2011	4
2012	4
2013	4
2014	2
2015	2
2016	2
2017	1
2018	1
2019	2
2020	2
2021	2
2022	2