(Justin Sullivan/GETTY IMAGES)

Postal officials are hoping the latest numbers will finally compel lawmakers to grant them new legal authority to alter delivery schedules, close post offices and lay off hundreds of thousands of workers.

Competing legislative proposals from Democrats and Republicans in the House and Senate are pending, and Postmaster General Patrick R. Donahoe wants lawmakers to vote by month’s end, when the Postal Service will have to pay more than $7 billion in statutory labor and health-care costs that Donahoe says are chiefly responsible for its financial collapse.

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