user: Question: when did the club Citizen achieve its last top division title?
Columns: ['Club', 'Position in 2012–13', 'First season in top division', 'Number of seasons in top division', 'First season of current spell in top division', 'Top division titles', 'Last top division title']
Types: ['text', 'text', 'text', 'real', 'text', 'real', 'text']
Sample row: ['Biu Chun Rangers', '6th', '1965–66', 35.0, '2012–13', 1.0, '1970–71']
SQL:

assistant: SELECT "Last top division title" FROM "Table" WHERE "Club" = 'Citizen';