user: Question: what is the average enrollment when the team nickname is wolverines and founded is after 1817?
Columns: ['Institution', 'Location', 'Founded', 'Affiliation', 'Enrollment', 'Team Nickname']
Types: ['text', 'text', 'real', 'text', 'real', 'text']
Sample row: ['Ferris State University', 'Big Rapids, Michigan', 1884.0, 'Public', 13532.0, 'Bulldogs']
SQL:

assistant: SELECT AVG("Enrollment") FROM "Table" WHERE "Team Nickname" = 'wolverines' AND "Founded" > 1817.0;