Table:
text: 2010 Catalan motorcycle Grand Prix
125 cc classification
125 cc classification
Pos No_ Rider Bike Laps Time_ Grid Points_
Ret 40 Nicolás Terol Aprilia 21 Accident 4 
Ret 39 Luis Salom Aprilia 14 Retirement 15 
Ret 17 Eduard López Aprilia 11 Retirement 31 
Ret 55 Isaac Viñales Aprilia 10 Accident 21 
Ret 50 Sturla Fagerhaug Aprilia 7 Accident 17 
Ret 5 Alexis Masbou Aprilia 5 Accident 9 
Ret 12 Esteve Rabat Aprilia 0 Accident 7 
Ret 53 Jasper Iwema Aprilia 0 Accident 20 
DNS 32 Lorenzo Savadori Aprilia  Did not start 29

Question: How many racers did not start at the 2010 Catalan Motorcycling Grand Prix?