user: Question: What is the capacity of the stadium with a rank lower than 31 located in the city of Belém ?
Columns: ['Rank', 'Stadium', 'Capacity', 'City', 'Country']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'Monumental "U"', '80,093', 'Lima', 'Peru']
SQL:

assistant: SELECT "Capacity" FROM "Table" WHERE "Rank" < 31.0 AND "City" = 'Belém';