Pakistan\'s benchmark stock index, the Karachi Stock Exchange 100 Index, fell 0.17 per cent at the close. The index of 100 companies traded on the Karachi Stock Exchange fell 20.79 to 12,317.15. Among the stocks in the index, 23 rose, 54 fell and 23 were unchanged. Declines in the Karachi Stock Exchange 100 Index were led by Oil & Gas Development Co, Habib Bank Ltd and Fauji Fertilizer Co Ltd. Pakistan Oilfields Ltd, which fell Rs1 to Rs354.13, was the most active stock by value in Pakistan. Article continues below The next most-active issues were Attock Refinery Ltd, which fell Rs1 to Rs128.40, and Engro Corp Ltd/pakistan, which fell Rs1.82 to Rs183.59. Meanwhile, Pakistan\'s central bank sold Rs77.6 billion ($903 million) of benchmark six-month treasury bills at yields lower than the previous auction.