Year	years
1999	4
2000	4
2001	4
2002	4
2003	6
2004	6
2005	6
2006	5
2007	5
2008	5
2009	5
2010	5
2016	3
2017	3
2018	3
2019	3
2020	3
2021	3
2022	3
2023	3