user: Question: What are the average laps driven in the GT class?
Columns: ['Year', 'Team', 'Co-Drivers', 'Class', 'Laps', 'Pos.', 'Class Pos.']
Types: ['real', 'text', 'text', 'text', 'real', 'text', 'text']
Sample row: [2004.0, 'JMB Racing', 'Jean-René de Fornoux Stéphane Daoudi', 'GT', 133.0, 'DNF', 'DNF']
SQL:

assistant: SELECT AVG("Laps") FROM "Table" WHERE "Class" = 'GT';