FILE - In this March 1, 2013 photo, containers are placed on a trailer by a crane after being removed from a ship at the Port of Baltimore's Seagirt Marine Terminal in Baltimore. The government reports on worker productivity and labor costs in the January-March quarter on Thursday, May 2, 2013. (AP Photo/Patrick Semansky, File)

Associated Press
FILE - In this March 1, 2013 photo, containers are placed on a trailer by a crane after being removed from a ship at the Port of Baltimore's Seagirt Marine Terminal in Baltimore. The government reports on worker productivity and labor costs in the January-March quarter on Thursday, May 2, 2013. (AP Photo/Patrick Semansky, File)
FILE - In this March 1, 2013 photo, containers are placed on a trailer by a crane after being removed from a ship at the Port of Baltimore's Seagirt Marine Terminal in Baltimore. The government reports on worker productivity and labor costs in the January-March quarter on Thursday, May 2, 2013. (AP Photo/Patrick Semansky, File)
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