Year	years
1998	7.5
1999	7.5
2000	7.5
2001	7.5
2002	7.5
2003	9
2004	9
2005	10
2006	10
2007	9
2008	9
2009	9
2010	9
2011	9
2012	9
2013	9
2014	9
2015	9
2016	9
2017	9
2018	9
2019	9
2020	9
2021	9
2022	9
2023	9