What's the 1981 census of Livorno?
CREATE TABLE table_15978 (
    "#" real,
    "City" text,
    "1981 Census" real,
    "1991 Census" real,
    "2001 Census" real,
    "2010 Est." real,
    "Region" text
)
SELECT "1981 Census" FROM table_15978 WHERE "City" = 'Livorno'
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's the 1981 census of Livorno? ### Input: CREATE TABLE table_15978 (
    "#" real,
    "City" text,
    "1981 Census" real,
    "1991 Census" real,
    "2001 Census" real,
    "2010 Est." real,
    "Region" text
) ### Response: SELECT "1981 Census" FROM table_15978 WHERE "City" = 'Livorno'