CREATE TABLE table_15976 ("#" FLOAT, "City" CLOB, "1981 Census" FLOAT, "1991 Census" FLOAT, "2001 Census" FLOAT, "2010 Est." FLOAT, "Region" CLOB)

What's the 1991 census of the city of Carpi?
SELECT MAX("1991 Census") FROM table_15976 WHERE "City" = 'Carpi'
SELECT MAX("1991 Census") FROM "table_15976" WHERE "City" = 'Carpi'