Table:
text: 1964 Belgian Grand Prix
Classification
Classification
Driver Constructor_ Laps Time_Retired Grid
Jim Clark Lotus - Climax 32 2:06:40.5 6
Bruce McLaren Cooper - Climax 32 + 3.4 7
Jack Brabham Brabham - Climax 32 + 48.1 3
Richie Ginther BRM 32 + 1:58.6 8
Graham Hill BRM 31 Fuel Pump 2
Dan Gurney Brabham - Climax 31 Out of Fuel 1
Trevor Taylor BRP - BRM 31 + 1 lap 12
Giancarlo Baghetti BRM 31 + 1 lap 17
Peter Arundell Lotus - Climax 28 Overheating 4
Innes Ireland BRP - BRM 28 + 4 laps 16
Peter Revson Lotus - Climax 28 Disqualified 10

Question: What is the average starting grid for Jack Brabham over 32 laps in the 1964 Belgian Grand Prix?