user: Question: What was the earliest date an institution was founded that joined in 1977? 
Columns: ['Institution', 'Nickname', 'Location (all in Minnesota)', 'Founded', 'Type', 'Enrollment', 'Joined']
Types: ['text', 'text', 'text', 'real', 'text', 'real', 'text']
Sample row: ['Augsburg College', 'Auggies', 'Minneapolis', 1869.0, 'Private/Lutheran (ELCA)', 3785.0, '1924']
SQL:

assistant: SELECT MIN("Founded") FROM "Table" WHERE "Joined" = '1977';