user: Question: Name the average year for Manly-Warringah Sea Eagles
Columns: ['Margin', 'Score', 'Opponent', 'Venue', 'Year']
Types: ['real', 'text', 'text', 'text', 'real']
Sample row: [56.0, '6-62', 'Penrith Panthers', 'Penrith Stadium', 2013.0]
SQL:

assistant: SELECT AVG("Year") FROM "Table" WHERE "Opponent" = 'Manly-Warringah Sea Eagles';