Year	number
2003	7.75
2004	7.2
2005	7.2
2006	7.2
2007	7
2008	7
2009	7.2
2010	7
2011	7
2012	7
2013	8.75
2014	8.875
2015	8.625
2016	8.5
2017	8.375
2018	7.75
2019	7.125