Its 1,397 supercenters account for 19 percent of the nation's grocery sales, making it the largest grocery retailer.

The hobby and toy business grew while grocery sales languished.

In 1992, the five leading food chains had 19 percent of grocery sales.

Waitrose also published two-year figures, with grocery sales up 19.1pc on 2009 and like-for-likes 8.8pc higher.

Last year, clubs had an estimated $11 billion in grocery sales, or 6.2 percent of the total market, up sharply from a few years ago.

At one point, Pepsi actually surpassed Coke in grocery sales.

On the trading front, it said grocery sales had increased in the last two months "and the momentum has continued into November."

That could be because actual online grocery sales are still small.

Hence, Britain's five biggest supermarket groups now account for more than 60 per cent of all grocery sales.

No name and President's Choice products would go on to account for 25 percent of the company's domestic grocery sales or double the industry average.