Mexico's census shows the population has grown more quickly than expected, in part due to a drop in the number of people leaving to seek work.

Preliminary data released Thursday by the National Institute for Statistics and Geography says Mexico had 112.3 million inhabitants as of July. That was 3.6 million more than experts had projected.

The head of the institute, Eduardo Sojo, says the bigger-than-expected increase was likely due to a rise in births and a fall in migrants leaving the country.

Sojo says Mexico had been losing about 500,000 people a year to international migration but that number has likely fallen by about half. The global economic crisis, particularly the U.S. slump, has cut into the jobs available for migrants.