user: Question: What is the average year that anna thompson had an 8th place result in team competition at the world cross country championships in st etienne, france with
Columns: ['Year', 'Tournament', 'Venue', 'Result', 'Extra']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [2002.0, 'Commonwealth Games', 'Manchester , England', '9th', '5000 m']
SQL:

assistant: SELECT AVG("Year") FROM "Table" WHERE "Tournament" = 'world cross country championships' AND "Venue" = 'st etienne, france' AND "Extra" = 'team competition' AND "Result" = '8th';