Danone reported a 9.8 per cent increase in underlying sales to €3.4 billion, although the currency effect meant that reported growth was 5.7 per cent. The world's largest yoghurt producer said its dairy business witnessed the largest growth in the first quarter. It saw a 12.8 per cent increase in like-for-like sales for the first three months of the year, and the growth helped the company to achieve its best quarterly results in the last five years, Danone claimed.On a reported basis, dairy division sales were €1.75 billion, up 14 per cent.