The document lists the top 50 container ports in the world by volume in 2009 and 2010. Shanghai, China was the largest port with over 29 million TEUs (twenty-foot equivalent units, a measure of cargo capacity) handled in 2010. The other top ports were Singapore, Hong Kong, Shenzhen and Busan. Overall, Chinese ports made up a large portion of the top 10 ports and continued to increase volumes from 2009 to 2010.