The number of suicides in the United States has been on the rise since 1999 in everyone between the ages of 10 and 74, according to a new report by the Centers for Disease Control and Prevention. Researchers at the CDC’s National Center for Health Statistics looked at data on cause of death for Americans 10 and older from 1999 to 2014. They also included information on age and race from death certificates. “The increase is broad-based,” said Sally C. Curtin, a statistician at the National Center for Health Statistics and lead author of the new report, which was released Thursday. Such an increase in suicides could also make prevention efforts more difficult. “If it were just one particular group, you could say ‘that is where we need to focus,’ ” Curtin said. The report is the first since 1999 to look at suicide rates among all age groups, she said. The number of suicides increased among all racial groups except for black males, who saw an 8% decline in suicide rate from 10.5 to 9.7 per 100,000 between 1999 and 2014, respectively. The largest increases were among American Indians and Alaska Natives; in this group, the suicide rate climbed by 89% among women and 38% among men. Suicide rates among white women and white men increased by 60% and 28%, respectively.