user: Question: What is the smallest number of big ten conference titles for teams with a capacity of 60670 and over 5 national titles?
Columns: ['Team', 'Established', 'Big Ten Conference Titles', 'National Titles', 'Venue', 'Opened', 'Capacity']
Types: ['text', 'real', 'real', 'real', 'text', 'real', 'real']
Sample row: ['Illinois Fighting Illini football', 1890.0, 15.0, 5.0, 'Memorial Stadium', 1923.0, 60670.0]
SQL:

assistant: SELECT MIN("Big Ten Conference Titles") FROM "Table" WHERE "Capacity" = 60670.0 AND "National Titles" > 5.0;