Four ships each month, or a total of 145 ships, have been lost over a three-year period from 2011 to 2013. The same period brought 228 casualties, with cruise ship Costa Concordia's wreck on January 13th 2012 - where 32 passengers were killed - weighing heavily in the statistics, according to a new report on accidents in international shipping during the past three years, published by the EU's European Maritime Safety Agency, EMSA.