user: ### NOW ANSWER:
Question: what is the year built of  Kyrkjebø?
Columns: ['Parish (Prestegjeld)', 'Sub-Parish (Sogn)', 'Church Name', 'Year Built', 'Location of the Church']
Types: ['text', 'text', 'text', 'real', 'text']
Sample row: ['Lavik Parish', 'Bjordal og Ortnevik', 'Bjordal kyrkje', 1906.0, 'Bjordal']
SQL:

assistant: SELECT AVG("Year Built") FROM "Table" WHERE "Sub-Parish (Sogn)" = 'Kyrkjebø';