user: Question: Name the total number of population for 1991 for 9564 for 2011
Columns: ['Urban settlement', 'Cyrillic Name', 'City / municipality', 'District', 'Population (1991)', 'Population (2002)', 'Population (2011)']
Types: ['text', 'text', 'text', 'text', 'real', 'real', 'real']
Sample row: ['Ada', 'Ада', 'Ada', 'North Banat', 12078.0, 10547.0, 9564.0]
SQL:

assistant: SELECT SUM("Population (1991)") FROM "Table" WHERE "Population (2011)" = 9564.0;