Canada's largest grocery chain, Loblaw, has said quarterly profits rose almost 20% due to stronger supermarket sales. Loblaw, which operates supermarkets under the Provigo and Loblaws banners, reported first-quarter net earnings of C$151m (US$106m), or 55 cents a share, up 19.8% from $126m, or 46 cents a share, in the year-ago period.