Season 1 ZDF , 1997 - 1998 Season 2 ZDF , 1999 Season 3 ZDF , 2000 Season 4 ZDF , 2000 Season 5 ZDF , 2001 Season 6 ZDF , 2002 Season 7 ZDF , 2003 Season 8 ZDF , 2004 Season 9 ZDF , 2005 Season 10 ZDF , 2005 Season 11 ZDF , 2007