Question: The 2006–07 Four Hills Tournament was a series of ski jumping competitions held in the traditional venues of Oberstdorf, Garmisch-Partenkirchen, Innsbruck and Bischofshofen, located in Germany and Austria, before the tournament started on which date, the World Cup leader was Simon Ammann, a Swiss ski jumper?
{'answer': '28 December 2006', 'supporting_facts': [['2006–07 Four Hills Tournament', 2], ['Simon Ammann', 0]]}