Statements of Financial Condition (Unaudited) - USD ($)	Mar. 31, 2019	Dec. 31, 2018
Assets
United States Treasury Obligations, at value (cost $361,795,667 and $405,208,278, respectively)	$ 361,816,083	$ 405,215,093
Affiliated Investments, at value (cost $97,787,532 and $94,692,742, respectively)	97,874,197	94,741,922
Receivable for:
Dividends from affiliates	54,193	44,281
Total assets	459,744,473	500,001,296
Other investments:
Variation margin payable- Commodity Futures Contracts	4,424,454	1,623,523
Payable for:
Due to custodian		3,213,714
Management fees	319,752	379,135
Brokerage commissions and fees	3,341	3,263
Total liabilities	4,747,547	5,219,635
Commitments and Contingencies (Note 10)
Equity
Shareholder's equity—General Shares	660	678
Shareholders' equity—Shares	454,996,266	494,780,983
Total shareholders' equity	454,996,926	494,781,661
Total liabilities and equity	$ 459,744,473	$ 500,001,296
General Shares outstanding	40	40
Shares outstanding	27,600,000	29,200,000
Net asset value per share	$ 16.49	$ 16.94
Market value per share	$ 16.49	$ 16.95