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?
Sentence (from "Simon Ammann"): Simon Ammann ( ; born 25 June 1981) is a Swiss ski jumper.
Relevant evidence: Yes