What was the 2006 population for the local government area of alexandrina council whose rank was smaller than 19?
CREATE TABLE table_name_66 (
    population_2006_census INTEGER,
    local_government_area VARCHAR,
    rank VARCHAR
)
SELECT AVG(population_2006_census) FROM table_name_66 WHERE local_government_area = "alexandrina council" AND rank < 19
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: What was the 2006 population for the local government area of alexandrina council whose rank was smaller than 19? ### Input: CREATE TABLE table_name_66 (
    population_2006_census INTEGER,
    local_government_area VARCHAR,
    rank VARCHAR
) ### Response: SELECT AVG(population_2006_census) FROM table_name_66 WHERE local_government_area = "alexandrina council" AND rank < 19