user: Question: What is the enrollment at the Private university?
Columns: ['Institution', 'Location - City', 'Location - State', 'Nickname', 'Founded', 'Affiliation', 'Enrollment', 'Primary Conference']
Types: ['text', 'text', 'text', 'text', 'real', 'text', 'real', 'text']
Sample row: ['Ball State University', 'Muncie', 'Indiana', 'Cardinals', 1918.0, 'Public', 21401.0, 'MAC']
SQL:

assistant: SELECT "Enrollment" FROM "Table" WHERE "Affiliation" = 'Private';