Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_15976 ( "#" real, "City" text, "1981 Census" real, "1991 Census" real, "2001 Census" real, "2010 Est." real, "Region" text )

### Question ###
What's the 1991 census of the city of Carpi?

### Accurate SQL ###

SELECT MAX("1991 Census") FROM table_15976 WHERE "City" = 'Carpi'