user: Question: Participation as of Actor, film editor has what average year?
Columns: ['Year', 'English title', 'Original title', 'Country', 'Length', 'Participation as']
Types: ['real', 'text', 'text', 'text', 'text', 'text']
Sample row: [1956.0, 'The Killers', 'Убийцы', 'Soviet Union', '19 min.', 'Actor']
SQL:

assistant: SELECT AVG("Year") FROM "Table" WHERE "Participation as" = 'Actor, film editor';