ISLAMABAD - Pakistan's foreign exchange reserves dropped to $14.909 billion in the week ending July 6 from $15.236 billion in the previous week, the central bank said on Thursday. Reserves held by the State Bank of Pakistan fell to $10.496 billion from $10.802 billion, while those held by commercial banks dropped slightly to $4.413 billion from $4.434 billion. Foreign exchange reserves hit a record $18.31 billion in July 2011, boosted by a $191.9 million loan from the World Bank and a $196.8 million loan from the ADB. Higher exports and record remittances have also supported Pakistan's reserves.