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