CREATE TABLE table_15978 ("#" FLOAT, "City" CLOB, "1981 Census" FLOAT, "1991 Census" FLOAT, "2001 Census" FLOAT, "2010 Est." FLOAT, "Region" CLOB)

What's the 1981 census of Livorno?
SELECT "1981 Census" FROM table_15978 WHERE "City" = 'Livorno'
SELECT "1981 Census" FROM "table_15978" WHERE "City" = 'Livorno'