Opening Head Count: Left Date IS NULL or Left Date > = 31/12/2006, Employment Date < = 01/01/2006, Casual Employees = False
Recruits: Employment Date > = 01/01/2006, Employment Date < = 31/12/2006, Casual Employees = False
Leavers: Left Date > = 01/01/2006, Left Date < = 31/12/2006, Casual Employees = False
Closing Head Count: Left Date IS NULL or Left Date > = 31/12/2006, Employment Date < = 31/12/2006, Casual Employees = False
Transfer Out: Opening Head Count + Recruits - Leavers - Closing Head Count
Transfer In: Closing Head Count - (Opening Head Count + Recruits - Leavers)
Staff Turnover: (Leavers + Transfer Out) / (Closing Head Count - Recruits)