Table:
text: 2002 Valencian Community motorcycle Grand Prix
MotoGP classification
MotoGP classification
Rider Manufacturer Laps Time_Retired Grid
Alex Barros Honda 30 47:22.404 2
Valentino Rossi Honda 30 +0.230 6
Max Biaggi Yamaha 30 +15.213 1
Daijiro Kato Honda 30 +22.504 3
Tohru Ukawa Honda 30 +35.165 7
Shinya Nakano Yamaha 30 +50.169 9
Jurgen vd Goorbergh Honda 30 +1:03.814 15
Jeremy McWilliams Proton KR 30 +1:05.079 8
Olivier Jacque Yamaha 30 +1:08.312 11
Norifumi Abe Yamaha 30 +1:08.312 20
John Hopkins Yamaha 30 +1:26.241 17
Andrew Pitt Kawasaki 30 +1:27.427 18
Sete Gibernau Suzuki 29 +1 lap 10
Tetsuya Harada Honda 29 +1 lap 22
Kenny Roberts, Jr. Suzuki 24 Retirement 14

text: 2002 Valencian Community motorcycle Grand Prix
MotoGP classification
MotoGP classification
Rider Manufacturer Laps Time_Retired Grid
Loris Capirossi Honda 19 Accident 12
David García Proton KR 13 Retirement 19
Garry McCoy Yamaha 6 Accident 4
Nobuatsu Aoki Proton KR 1 Accident 16
Régis Laconi Aprilia 1 Retirement 13
José Luis Cardoso Yamaha 0 Accident 21
Carlos Checa Yamaha 0 Accident 5

Question: What is the lowest lap with a manufacturer from Yamaha and a time/retirement of +1:08.312 and a starting grid of less than 20 for the 2002 Valencian Community Motorcycle Grand Prix?