Irish retailer Dunnes Stores has enjoyed its best sales growth figures for four years, according to according to the latest data from Kantar Worldpanel.

Figures published today (4 February) show the retailer reported saw sales increase 4.6% for the 12 weeks ending 20 January. Its market share reached 24.3% from last year’s 23.4%.

“4.6% sales growth is Dunnes’ strongest performance for four years and highlights the success of the ‘Shop and Save’ campaign launched in the run up to Christmas,” said Kantar commercial director David Berry. “Shoppers have responded well to this offer, picking up more items every time they shop and increasing the average size of their baskets by almost EUR3 (US$4.07) to EUR36.70 – an increase of 9%.”

The report showed a slight slowdown in sales growth and a fall in market share for retail giant Tesco in Ireland.

“Tesco has seen its share of the grocery market dip by half a percentage point this year, moving from 28.1% to 27.6%. Its sales growth has also declined by 1%,” said Berry. “This is the first time Tesco has dropped behind grocery market growth since October 2009, demonstrating the success of the retailer up until now.”

Aldi, however, continues to set the pace and enjoyed the strongest level of growth at 29.5%, albeit slightly below its previous rate of 30%.

Grocery inflation stood at 5.2% in the period, an increase on the 5% recorded last period and the highest since the 5.6% seen in May 2011.