Year	number
2004	6.5
2005	6.5
2006	6.5
2007	6
2008	6
2009	6
2010	6
2011	6
2012	6
2013	7
2014	7
2015	7
2016	7.125
2017	7.125
2018	6.95625
2019	6.9125