user: Question: What is the year joined with a Conference championships of 5, and a Nickname of Wolfpack?
Columns: ['Institution', 'City', 'State', 'Nickname', 'Joined', 'Conference championships']
Types: ['text', 'text', 'text', 'text', 'real', 'real']
Sample row: ['George Washington University', 'Washington', 'District of Columbia', 'Colonials', 1995.0, 0.0]
SQL:

assistant: SELECT "Joined" FROM "Table" WHERE "Conference championships" = 5.0 AND "Nickname" = 'Wolfpack';