user: Question: What was the total number for the Bulls when they were at old trafford?
Columns: ['Date', 'Opponent', 'Bulls.', 'Opp.', 'Venue']
Types: ['text', 'text', 'real', 'real', 'text']
Sample row: ['13/02/05', 'Wakefield Trinity Wildcats', 16.0, 28.0, 'Grattan Stadium']
SQL:

assistant: SELECT SUM("Bulls.") FROM "Table" WHERE "Venue" = 'old trafford';