Table:
text: FAI World Grand Prix 2007
Race 2 - 20.12.2007
Race 2 - 20.12.2007
Position_ Pilot Glider Speed Distance
15 Oscar Goudriaan Ventus 109.6km/h 282.0km
16 Erwin Sommer Ventus 2ax 96.7km/h 282.0km
17 Tim McAllister Ventus C 92.8km/h 282.0km
18 Michael Sommer ASG 29 10.7km/h 282.0km

Question: For the FAI World Grand Prix 2007, what is Erwin Sommer's average position race 2 20 12 2007?