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Financial Highlights
6 Months Ended
Jun. 30, 2010
Financial Highlights [Abstract]  
Financial Highlights
2.  
Financial Highlights
ChChanges in the net asset value per Unit for the three and six months ended June 30, 2011 and 2010 were as follows:
 
                                                                  For the Three                                                                    For the Six
                                                           Months Ended June 30,                                              Months Ended June 30,

 
2011
2010
2011
2010
         Per Unit operating performance:
       
         Net asset value at the beginning of the period:
$     36.44
$     36.22
$     38.03
$     37.96
         
                     Interest Income
�     (3)
0.01
0.01
0.01
                     Expenses
       (0.87)
       (0.74)
       (1.74)
       (1.50)
                     Realized Loss (1)
       (0.81)
       (0.54)
       (0.33)
       (1.94)
                     Unrealized Loss
       (0.73)
       (1.38)
       (1.94)
       (0.96)
                     Net Loss
       (2.41)
       (2.65)
       (4.00)
       (4.39)
         
         Net asset value, June 30:
 $    34.03
 $    33.57
 $    34.03
 $    33.57
         
         Ratios to average net assets:
       
                     Net Investment Loss  (2)
      (8.8)%
      (8.5)%
      (9.0)%
      (8.6)%
                     Expenses before Incentive Fees (2)
       8.5 %
       8.6 %
       8.5 %
       8.6 %
                     Expenses after Incentive Fees (2)
       8.8 %
       8.6 %
       9.0 %
       8.6 %
                     Net Loss  (2)
    (25.8)%
    (30.9)%
    (21.3)%
    (25.5)%
         Total return before incentive fees
      (6.3)%
      (7.3)%
    (10.0)%
    (11.6)%
         Total return after incentive fees
      (6.6)%
      (7.3)%
    (10.5)%
    (11.6)%


   (1) Realized 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.