While the United States has failed to significantly reduce its annual rate of gun deaths, other high income countries have been making steadier progress, resulting in a wider gap between the U.S. and its international peers when it comes to fatal shootings.

That’s the conclusion of an upcoming study by public health researchers David Hemenway and Erin Grinshteyn. Using 2010 data from the World Health Organization (WHO), the academics found that firearm homicide rates were 25 times higher in the U.S. than in other high-income countries. The research is an update to a study on WHO data from 2003, which determined the U.S.’s rate to be just 19.5 times higher than that of comparable nations. The math behind the increasing divergence comes down to this: While per capita gun deaths declined in the U.S. over the period in question, the decrease was a small dip from an anomalously high rate. In other high-income nations, already much lower rates have fallen farther.