How many Grand Prix were the winning constructor Benetton - Ford and the pole position was Michael Schumacher?
{'header': ['Round', 'Grand Prix', 'Pole Position', 'Fastest Lap', 'Winning Driver', 'Winning Constructor', 'Report'], 'page_title': '1994 Formula One season', 'section_title': 'Grands Prix', 'caption': 'Grands Prix', 'rows': [['1', 'Brazilian Grand Prix', 'Ayrton Senna', 'Michael Schumacher', 'Michael Schumacher', 'Benetton - Ford', 'Report'], ['2', 'Pacific Grand Prix', 'Ayrton Senna', 'Michael Schumacher', 'Michael Schumacher', 'Benetton - Ford', 'Report'], ['3', 'San Marino Grand Prix', 'Ayrton Senna', 'Damon Hill', 'Michael Schumacher', 'Benetton - Ford', 'Report'], ['4', 'Monaco Grand Prix', 'Michael Schumacher', 'Michael Schumacher', 'Michael Schumacher', 'Benetton - Ford', 'Report'], ['5', 'Spanish Grand Prix', 'Michael Schumacher', 'Michael Schumacher', 'Damon Hill', 'Williams - Renault', 'Report'], ['6', 'Canadian Grand Prix', 'Michael Schumacher', 'Michael Schumacher', 'Michael Schumacher', 'Benetton - Ford', 'Report'], ['7', 'French Grand Prix', 'Damon Hill', 'Damon Hill', 'Michael Schumacher', 'Benetton - Ford', 'Report'], ['8', 'British Grand Prix', 'Damon Hill', 'Damon Hill', 'Damon Hill', 'Williams - Renault', 'Report'], ['9', 'German Grand Prix', 'Gerhard Berger', 'David Coulthard', 'Gerhard Berger', 'Ferrari', 'Report'], ['10', 'Hungarian Grand Prix', 'Michael Schumacher', 'Michael Schumacher', 'Michael Schumacher', 'Benetton - Ford', 'Report'], ['11', 'Belgian Grand Prix', 'Rubens Barrichello', 'Damon Hill', 'Damon Hill', 'Williams - Renault', 'Report'], ['12', 'Italian Grand Prix', 'Jean Alesi', 'Damon Hill', 'Damon Hill', 'Williams - Renault', 'Report'], ['13', 'Portuguese Grand Prix', 'Gerhard Berger', 'David Coulthard', 'Damon Hill', 'Williams - Renault', 'Report'], ['14', 'European Grand Prix', 'Michael Schumacher', 'Michael Schumacher', 'Michael Schumacher', 'Benetton - Ford', 'Report'], ['15', 'Japanese Grand Prix', 'Michael Schumacher', 'Damon Hill', 'Damon Hill', 'Williams - Renault', 'Report']]}