Year	years
1998	9
1999	9
2000	9
2001	9
2002	9
2003	9
2004	9
2005	9
2006	9
2007	8.5
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