user: Question: When was the last win of Celtic?
Columns: ['Club', 'Wins', 'Last win', 'Runners-up', 'Last final lost']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Rangers', '48', '2013', '20', '2011']
SQL:

assistant: SELECT "Last win" FROM "Table" WHERE "Club" = 'Celtic';