Year	Number
2003	9.16529
2004	8.71538
2005	8.62308
2006	8.38433
2007	7.12381
2008	6.5
2009	6.50305
2010	6.13353
2011	7.83658
2012	7.44361
2014	7.8063
2015	7.84524
2016	7.68462
2017	7.80156