French retail giant Carrefour reported on Thursday a slump in its second-quarter sales, largely due to its decision to cease operations in several countries. Sales for the period ending June reached 20.46 billion euros ($27 billion), down 5.7 percent from the figure a year ago, the firm -- world\'s second-biggest retailer -- said. The sharp fall was due mostly to a much higher base of comparison in 2012, when figures included sales from Indonesia, Malaysia, Singapore and Greece -- markets where Carrefour has withdrawn from. The data also included sales in Turkey, where the retailer is currently renegotiating a partnership contract. If sales from these countries were not taken into account, the dip in sales reached only 0.6 percent. The group\'s financial director Pierre-Jean Sivignon said: \"Our performance for the period is solid, given the difficult environment.\"