user: ### NOW ANSWER:
Question: What year had a date of TBA where the Oakland Raiders were the home team?
Columns: ['Year', 'Date', 'Television', 'Designated Visitors', 'Designated Home', 'Stadium', 'City']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [2007.0, 'October 28', 'Fox', 'New York Giants', 'Miami Dolphins', 'Wembley Stadium', 'London']
SQL:

assistant: SELECT AVG("Year") FROM "Table" WHERE "Date" = 'TBA' AND "Designated Home" = 'Oakland Raiders';