Question: How many have been replaced where the appointment date is 10 December 2007 and the manner of departure is Quit?
SQL: SELECT COUNT("Replaced by") FROM "1-11713303-2" WHERE "Date of appointment" = '10 December 2007' AND "Manner of departure" = 'Quit';

Question: What is the date of vacancy for 10 December 2007 when Quit?
SQL: SELECT "Date of vacancy" FROM "1-11713303-2" WHERE "Date of appointment" = '10 December 2007' AND "Manner of departure" = 'Quit';

Question: How many manners of departure did Peter Voets have?
SQL: SELECT COUNT("Manner of departure") FROM "1-11713303-2" WHERE "Outgoing manager" = 'Peter Voets';