Table:
text: 1998 British Grand Prix
Race
Race
Driver Constructor_ Laps Time_Retired Grid
Rubens Barrichello Stewart - Ford 39 Accident 16
Jos Verstappen Stewart - Ford 38 Engine 15
David Coulthard McLaren - Mercedes 37 Spun off 4
Jarno Trulli Prost - Peugeot 37 Spun off 14
Ricardo Rosset Tyrrell - Ford 29 Spun off 20
Esteban Tuero Minardi - Ford 29 Spun off 18
Johnny Herbert Sauber - Petronas 27 Spun off 9
Mika Salo Arrows 27 Throttle 13
Heinz-Harald Frentzen Williams - Mecachrome 15 Spun off 6
Damon Hill Jordan - Mugen-Honda 13 Spun off 7

text: 1998 British Grand Prix
Race
Race
Driver Constructor_ Laps Time_Retired Grid
Michael Schumacher Ferrari 60 1:47:02.450 2
Mika Häkkinen McLaren - Mercedes 60 +22.465 1
Eddie Irvine Ferrari 60 +29.199 5
Alexander Wurz Benetton - Playlife 59 +1 Lap 11
Giancarlo Fisichella Benetton - Playlife 59 +1 Lap 10
Ralf Schumacher Jordan - Mugen-Honda 59 +1 Lap 21
Jacques Villeneuve Williams - Mecachrome 59 +1 Lap 3
Shinji Nakano Minardi - Ford 58 +2 Laps 19
Toranosuke Takagi Tyrrell - Ford 56 +4 Laps 17
Jean Alesi Sauber - Petronas 53 Electrical 8
Pedro Diniz Arrows 45 Spun off 12
Olivier Panis Prost - Peugeot 40 Spun off 22

Question: What is the average lap count for Mika Salos Arrows car with a grid above 13 in the 1998 British Grand Prix?