In which year did Blount County build a bridge in Cleveland that was listed on 1981-08-20?
CREATE TABLE table_name_78 (
    built VARCHAR,
    location VARCHAR,
    county VARCHAR,
    listed VARCHAR
)
SELECT built FROM table_name_78 WHERE county = "blount" AND listed = "1981-08-20" AND location = "cleveland"
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: In which year did Blount County build a bridge in Cleveland that was listed on 1981-08-20? ### Input: CREATE TABLE table_name_78 (
    built VARCHAR,
    location VARCHAR,
    county VARCHAR,
    listed VARCHAR
) ### Response: SELECT built FROM table_name_78 WHERE county = "blount" AND listed = "1981-08-20" AND location = "cleveland"