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Financial Highlights
3 Months Ended
Mar. 31, 2013
Financial Highlights [Abstract]  
Financial Highlights
2.
Financial Highlights
 
Financial Highlights for the quarters ended March 31, 2013 and 2012 were as follows:

   
For the Quarters Ended March 31,
 
   
2013
  
2012
 
Per Unit Operating Performance:
      
Net asset value, January 1:
 $27.76  $31.24 
          
Interest Income
  (3)  (3)
Expenses
  (0.56)  (0.62)
Realized/Unrealized Income (1)
  1.18   0.46 
Net Income (Loss)
  0.62   (0.16)
          
Net asset value, March 31:
 $28.38  $31.08 
          
Ratios to average net assets:
        
Net Investment Loss (2)
  (7.9)%  (8.0)%
Expenses before  Incentive Fees (2)
  8.0%  8.0%
Expenses after Incentive Fees (2)
  8.0%  8.0%
Net Income (Loss) (2)
  9.3%  (1.9) %
Total return before incentive fees
  2.2%  (0.5)%
Total return after incentive fees
  2.2%  (0.5)%
 
(1)
Realized/Unrealized Income (Loss) is a balancing amount necessary to reconcile the change in net asset value per Unit with the other per Unit information.
 
(2)
Annualized (except for incentive fees, if applicable).
 
(3)
Amounts less than $0.005 per Unit.