what is the year built of  kyrkjebø?
CREATE TABLE table_name_20 (year_built INTEGER, sub_parish__sogn_ VARCHAR)
SELECT AVG(year_built) FROM table_name_20 WHERE sub_parish__sogn_ = "kyrkjebø"
### Context: CREATE TABLE table_name_20 (year_built INTEGER, sub_parish__sogn_ VARCHAR) ### Question: what is the year built of  kyrkjebø? ### Answer: SELECT AVG(year_built) FROM table_name_20 WHERE sub_parish__sogn_ = "kyrkjebø"