Aldi founder Karl Albrecht has returned to Forbes’ top 10 richest people in the world.

The Forbes Billionaires 2012 list, published yesterday, ranks the 92-year-old 10th richest in the world, with an estimated personal net fortune of $25.4bn.

Last year, Albrecht – who founded the Aldi Süd business – was ranked 12th richest in the world. He has moved up the rankings this year, even though Forbes estimates his net worth has declined by $100m over the past 12 months.

Christy Walton of the Walmart family remained the richest woman in the world, ranking just outside the top 10 at 11th, with a net fortune of $25.3bn.

Mexican billionaire Carlos Slim Helu topped the list, with a $69bn fortune. Other retail-related top 10 billionaires were Bernard Arnault, of luxury brand LVMH, who ranked fourth ($41bn), with Zara fashion magnate Amancio Ortega ranking fifth ($37.5bn), and H&M vice president Stefan Persson ranking eighth ($26bn).