Year	years
1998	9
1999	9
2000	9
2001	9
2002	9
2003	9
2004	9
2005	9
2006	9
2007	9
2008	9
2009	9
2010	9
2011	9
2012	9
2013	9
2014	9.5
2015	9.5
2016	9.5
2017	10
2018	10
2019	10
2020	10
2021	10
2022	10
2023	10