user: Question: When is the date of appointment when the position in table is 16?
Columns: ['Team', 'Outgoing head coach', 'Manner of departure', 'Date of vacancy', 'Position in table', 'Incoming head coach', 'Date of appointment']
Types: ['text', 'text', 'text', 'text', 'real', 'text', 'text']
Sample row: ['Rah Ahan', 'Rasoul Korbekandi', 'Sacked', '7 Sep 2010', 18.0, 'Mehdi Tartar', '8 Sep 2010']
SQL:

assistant: SELECT "Date of appointment" FROM "Table" WHERE "Position in table" = 16.0;