Year	years
1999	5
2000	5
2001	5
2002	5
2003	5
2004	5
2005	5
2006	5
2007	5
2008	5
2009	5
2010	5
2011	5
2012	5
2013	5.5
2014	5.5
2015	5.5
2016	5.5
2017	5.5
2018	6
2019	6
2020	6
2021	6
2022	6
2023	6