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Condensed Statements of Operations - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Gain (loss) on trading of commodity futures contracts: |  |  |  |
Realized gain (loss) on closed futures contracts | $ (237,461,770) | $ 719,826,560 | $ (392,732,210) | $ 504,268,950
Change in unrealized gain (loss) on open futures contracts | (21,053,970) | (74,855,450) | (117,545,460) | (33,328,530)
Dividend income | 1,035,939 | 572,471 | 1,894,828 | 920,883
Interest income | 4,094,212 | 2,323,518 | 7,035,151 | 4,068,781
ETF transaction fees | 88,650 | 69,000 | 158,000 | 154,000
Total income (loss) | (253,296,939) | 647,936,099 | (501,189,691) | 476,084,084
Expenses |  |  |  |
General Partner management fees (Note 3) | 3,231,514 | 3,924,293 | 6,458,103 | 7,843,623
Professional fees | 595,272 | 673,118 | 1,185,752 | 1,346,433
Brokerage commissions | 1,365,114 | 1,603,540 | 2,526,521 | 3,832,708
Directors' fees and insurance | 89,727 | 94,090 | 180,337 | 181,641
License fees | 107,717 | 130,810 | 215,270 | 261,454
Registration fees | 86,868 | 83,367 | 172,781 | 164,336
Total expenses | 5,476,212 | 6,509,218 | 10,738,764 | 13,630,195
Net income (loss) | $ (258,773,151) | $ 641,426,881 | $ (511,928,455) | $ 462,453,889
Net income (loss) per limited partnership share | $ (1.15) | $ 1.82 | $ (2.24) | $ 0.54
Net income (loss) per weighted average limited partnership share | $ (0.9) | $ 2.03 | $ (1.86) | $ 1.34
Weighted average limited partnership shares outstanding | 287,768,132 | 316,056,044 | 274,777,348 | 345,501,648

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