Singapore port operator PSA International Pte Ltd said its container cargo volume rose 5.6 percent in 2011 from 2010 but warned that the outlook for this year was uncertain due to the expected slowdown in global growth.

"As we enter 2012, the outlook for the year remains uncertain as countries struggle with the projected slowdown in growth and the potential impact on national economies," Tan Chong Meng, Group Chief Executive Officer of PSA International, said.

PSA said it handled 57.09 million twenty-foot equivalent units (TEUs) of containers at its port projects around the world while the volume handled by its terminals in Singapore rose 6.1 percent to a new record of 29.37 million TEUs, the company said in a statement published on its website. (Reuters)