Task: Question Answering
Input (English): Passage: Coming off their bye week, the Patriots flew to Heinz Field for a Week 8 duel with the Pittsburgh Steelers.  New England trailed early in the first quarter, as Steelers quarterback Ben Roethlisberger completed a 5-yard touchdown pass to running back Mewelde Moore. Pittsburgh would add to their lead in the second quarter, as placekicker Shaun Suisham nailed a 33-yard field goal. The Patriots answered, with quarterback Tom Brady finding wide receiver Deion Branch on a 2-yard touchdown pass, but the Steelers came right back, with Roethlisberger completing a 7-yard touchdown pass to wide receiver Antonio Brown. New England would close out the half with a 46-yard field goal from placekicker Stephen Gostkowski. Pittsburgh began the third quarter with Suisham making a 21-yard field goal, followed by a 23-yard field goal in the fourth. The Patriots tried to rally, as Brady connected with tight end Aaron Hernandez on a 1-yard touchdown pass, but the Steelers' defense would prevail, with safety Troy Polamalu forcing a New England fumble out of the back of the end zone for a safety. With the loss, the Patriots fell to 5-2, being the first defeat by Steelers with Tom Brady starting at quarterback in the previous seven seasons. 
Question: How many seasons has it been since Tom Brady led Patriots have lost to the Steelers? 
Answer type: Number 
Output (English): 7.