Statements of Financial Condition (Unaudited) - USD ($)	Jun. 30, 2016	Dec. 31, 2015
Assets
United States Treasury Obligations, at fair value (cost $789,863,093 and $1,077,885,299, respectively)	$ 789,905,910	$ 1,077,913,905
Cash held by custodian	43,586,593	51,943,740
Variation margin receivable	3,443,220	4,489,462
Total assets	836,935,723	1,134,347,107
Liabilities
Management fee payable	508,406	728,477
Brokerage fee payable	4,563	3,814
Total liabilities	512,969	732,291
Commitments and Contingencies (Note 9)
Equity
Shareholder's equity—General Shares	996	1,026
Shareholders' equity—Shares	836,421,758	1,133,613,790
Total shareholders' equity	836,422,754	1,133,614,816
Total liabilities and equity	$ 836,935,723	$ 1,134,347,107
General Shares outstanding	40	40
Shares outstanding	33,600,000	44,200,000
Net asset value per share	$ 24.89	$ 25.65
Market value per share	$ 24.85	$ 25.64