ROME - The number of chronically hungry people in the world dipped considerably below the one billion mark - the first drop in 15 years - partly because food prices fell after spikes sparked rioting in many countries a few years ago, U.N. agencies said Tuesday.

Still, 925 million people are undernourished worldwide, and the latest estimates don't reflect the repercussions of the huge flooding in Pakistan.

The Rome-based Food and Agriculture Organization's report said there was progress in the battle to end hunger, but stressed the world was far from achieving the U.N.-promoted Millennium Development Goal of halving the proportion of undernourished people from 20 percent in 1990-92 to 10 percent in 2015.

The report estimated there were 98 million fewer chronically hungry people than in 2009, when the figure just topped one billion.

U.N. officials announcing the figures said that 1,800 calories per day was considered the minimum energy intake on average. Anyone regularly without that intake would be considered undernourished, or "chronically hungry."

The drop in the number of chronically hungry is partly because food prices have fallen from peaks in 2007-08, when they sparked violence in several developing countries, and because cereal and rice harvests have been strong.

Cereal production this year was the third-highest ever recorded, despite a drought-fueled wheat shortfall in Russia, said the FAO's director-general, Jacques Diouf.

Also heartening, Diouf noted, is that cereal stocks are high - 100 million tons more than the low levels of 2007-08, when 38 countries shut down their food export markets in reaction.

Increased demand for biofuels and soaring petroleum prices took much of the blame for the spiraling-upward prices then.

Food prices are still "stubbornly" high, but "we haven't seen the type of behavior . . . panic buying" that helped feed the speculation and fears of a couple of years ago, said Josette Sheeran, the executive director of the U.N. World Food Program.

Earlier this month, a U.N. human-rights expert urged governments to crack down on price speculation and boost food production. Deadly riots over food prices hit Mozambique recently, and the FAO has called a special meeting for Sept. 24 to discuss recently rising food prices.

The drop below the one billion mark also reflects progress China and India have made in feeding their citizens.

Still, those two nations, with their huge populations, account for 40 percent of the world's undernourished people. Overall, two-thirds of the chronically undernourished live in China, India, Bangladesh, Indonesia, Pakistan, Congo, and Ethiopia, the report said.

The flooding in Pakistan is also a variable that could affect future numbers. The floods have affected millions and robbed farmers of crops about to be harvested, next season's farmland and seed.

While welcoming the dip in the number of hungry, the nongovernmental aid agency Oxfam attributed the improvement largely "to luck" and not to a change in policies or increased investment "needed to address the underlying causes in hunger."