19 of the 26 major commodities fell this week, after the U.S. Federal Reserve chairman Ben Bernanke suggested the central bank may be done with its monetary stimulus next year.
Precious metals were hit hardest, with silver losing 10%, and gold dropping 7%, breaking through the 1300 mark.
The energy sector was a relative sea of calm compared to the sell-off seen on the broader markets, but it also suffered some losses. 
Agriculture did see some gains,lifted by wheat and corn.
Saxo Bank's Head of Commodity Strategy explains the reasons behind the numbers.