KARACHI (Reuters) - Pakistans foreign exchange reserves fell to $15.05 billion in the week that ended on May 14 from $15.36 billion the previous week, the SBP said on Thursday. Reserves held by the State Bank of Pakistan (SBP) fell to $11.27 billion from $11.55 billion a week earlier, while those held by commercial banks also eased to $3.78 billion from $3.81 billion, the State Bank of Pakistan said. Pakistan received a fifth tranche, amounting to $1.13 billion, of a $10.66 billion IMF loan, the SBP said on Wednesday. The SBPs spokesman said the latest tranche would be reflected in foreign exchange reserve data released next week. The IMFs board agreed to release the $1.13 billion in aid for Pakistan and waive some of its requirements at a review last Friday. The IMF loan package was agreed in November 2008 to help avert a balance of payments crisis and shore up reserves. Pakistans foreign reserves hit a record high of $16.5 billion in October 2007 but fell steadily to $6.6 billion by November 2008, largely because of a soaring import bill.