Table:
text: Anna Thompson (athlete)
Achievements
Achievements
Year_ Tournament Venue Result_ Extra
2002 Commonwealth Games Manchester , England 9th 5000 m
2002 World Cross Country Championships Dublin , Ireland 15th Short race
2002 World Cross Country Championships Dublin , Ireland 5th Team competition
2005 World Cross Country Championships St Etienne , France 19th Short race
2005 World Cross Country Championships St Etienne , France 7th Team competition
2005 World Cross Country Championships St Etienne , France 16th Long race
2005 World Cross Country Championships St Etienne , France 8th Team competition
2006 Commonwealth Games Melbourne , Australia 5th 10,000 m
2006 World Cross Country Championships Fukuoka , Japan 3rd Team competition

text: Anna Thompson (athlete)
Achievements
Achievements
Year_ Tournament Venue Result_ Extra
2006 World Road Running Championships Debrecen , Hungary 18th 20 km run
2007 World Cross Country Championships Mombasa , Kenya 18th Senior race
2007 World Cross Country Championships Mombasa , Kenya 6th Team competition
2008 World Cross Country Championships Edinburgh , Scotland 3rd Team competition

Question: From Anna Thompson's (Athlete) list, what is the average year that Anna Thompson has achieved an 8th place finish in team competition at the World Cross Country Championships in St. Etienne, France?