Singapore's Neptune Orient Lines, the world's eighth-biggest container shipping firm, said it carried 13 percent more containers on its ships in the four weeks to April 4 compared with the same period a year ago. The company said in a statement on Monday that its shipping arm APL carried the equivalent of 198,300 40-foot containers on its ships in that period. The average revenue on each container carried by the state-controlled firm rose 15 percent to $2,930, from $2,538 in the same period a year ago.