user: Question: On average, when were Vineyard schools founded?
Columns: ['School', 'Suburb/Town', 'Years', 'Founded', 'Website']
Types: ['text', 'text', 'text', 'real', 'text']
Sample row: ['Vacy Public School', 'Vacy', 'K-6', 1859.0, 'website']
SQL:

assistant: SELECT AVG("Founded") FROM "Table" WHERE "Suburb/Town" = 'Vineyard';