user: Question: How many years was the number of laps 71?
Columns: ['Year', 'Team', 'Co-Drivers', 'Class', 'Laps', 'Pos.', 'Class Pos.']
Types: ['real', 'text', 'text', 'text', 'real', 'text', 'text']
Sample row: [1997.0, 'BMS Scuderia Italia', 'Pierluigi Martini Antônio Hermann de Azevedo', 'GT1', 317.0, '8th', '4th']
SQL:

assistant: SELECT COUNT("Year") FROM "Table" WHERE "Laps" = 71.0;