Higher cargo volumes to Guam helped Matson report higher profits in the fourth quarter and for all of 2012. Horizon Lines, Matson’s main competitor in the U.S. mainland-to-Hawaii trade lane stopped serving Guam in late 2011 when it discontinued its U.S. West Coast-Guam-China service. Matson said it carried 25,500 containers between the U.S. mainland and Guam in 2012, 67.8 percent more than the 25,500 it carried in 2011. Matson said it had fourth...