user: Question: Can you tell me the average December rhat has the Opponent of @ Toronto Maple Leafs?
Columns: ['Game', 'December', 'Opponent', 'Score', 'Record']
Types: ['real', 'real', 'text', 'text', 'text']
Sample row: [21.0, 2.0, '@ Pittsburgh Penguins', '4 - 1', '10-8-3']
SQL:

assistant: SELECT AVG("December") FROM "Table" WHERE "Opponent" = '@ Toronto Maple Leafs';