Table:
text: 1975 Belgian Grand Prix
Classification
Classification
Driver Constructor_ Laps Time_Retired Grid
Niki Lauda Ferrari 70 1:43:53.98 1
Jody Scheckter Tyrrell - Ford 70 + 19.22 9
Carlos Reutemann Brabham - Ford 70 + 41.82 6
Patrick Depailler Tyrrell - Ford 70 + 1:00.08 12
Clay Regazzoni Ferrari 70 + 1:03.84 4
Tom Pryce Shadow - Ford 70 + 1:28.45 5
Emerson Fittipaldi McLaren - Ford 69 + 1 Lap 8
Carlos Pace Brabham - Ford 69 + 1 Lap 2
Bob Evans BRM 68 + 2 Laps 20
John Watson Surtees - Ford 68 + 2 Laps 18
Mark Donohue Penske - Ford 67 + 3 Laps 21

Question: For the 1975 Belgian Grand Prix, tell me the total number of grids for Bob Evans and less than 68 laps?