user: Question: What is the capacity for a facility opened in 1956?
Columns: ['Facility', 'Location', 'Year Opened', 'Major Facility', 'Population Gender', 'Capacity', 'Custody Level(s)']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['Airway Heights Corrections Center (AHCC)', 'Airway Heights', '1992', 'Yes', 'Male', 2258.0, 'MI-2 MI-3 Medium']
SQL:

assistant: SELECT "Capacity" FROM "Table" WHERE "Year Opened" = '1956';