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Statements of Cash Flows - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Cash Flows from Operating Activities: |  |  |
Net income (loss) | $ 666,552,810 | $ (1,288,412,920) | $ (489,273,234)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities: |  |  |
(Increase) decrease in commodity futures trading account - cash and cash equivalents | 301,869,975 | (276,673,230) | (254,254,816)
Unrealized (gain) loss on open futures contracts | (249,798,620) | (29,109,870) | 170,342,900
(Increase) decrease in dividends receivable | (214,021) | (3,836) | 2,875
(Increase) decrease in interest receivable | 0 | 0 | 52
(Increase) decrease in prepaid registration fees | (550,777) | (726,055) | 0
(Increase) decrease in ETF transaction fees receivable | 0 | (2,000) | 1,000
Increase (decrease) in payable due to Broker | 110,778,928 | 0 | 0
Increase (decrease) in General Partner management fees payable | 77,120 | 775,792 | 148,579
Increase (decrease) in professional fees payable | 623,632 | 305,047 | (329,999)
Increase (decrease) in brokerage commissions payable | (25,000) | 187,300 | 54,000
Increase (decrease) in directors' fees and insurance payable | (16,747) | 21,083 | 899
Increase (decrease) in license fees payable | 36,323 | 78,464 | 4,294
Increase (decrease) in registration fees payable | 0 | 0 | (153)
Net cash provided by (used in) operating activities | 829,333,623 | (1,593,560,225) | (573,303,603)
Cash Flows from Financing Activities: |  |  |
Addition of partnership shares | 4,489,405,734 | 9,185,457,218 | 5,182,907,528
Redemption of partnership shares | (5,123,398,604) | (6,005,791,475) | (4,041,408,175)
Net cash provided by (used in) financing activities | (633,992,870) | 3,179,665,743 | 1,141,499,353
Net Increase (Decrease) in Cash and Cash Equivalents | 195,340,753 | 1,586,105,518 | 568,195,750
Cash and Cash Equivalents, beginning of year | 2,725,177,054 | 1,139,071,536 | 570,875,786
Cash and Cash Equivalents, end of year | $ 2,920,517,807 | $ 2,725,177,054 | $ 1,139,071,536

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