user: Question: What is the average capacity that has Foligno as the city?
Columns: ['Club', 'City', 'Stadium', 'Capacity', '2007–08 season']
Types: ['text', 'text', 'text', 'real', 'text']
Sample row: ['A.C. Arezzo', 'Arezzo', 'Stadio Città di Arezzo', 13128.0, '7th in Serie C1/B']
SQL:

assistant: SELECT AVG("Capacity") FROM "Table" WHERE "City" = 'Foligno';