(WEBMD) – The United States’ suicide rate in 2017 was 33 percent higher than in 1999 and is at its highest since World War II, according to a new study.

It found that suicide rates among Americans ages 15-64 rose from 10.5 per 100,000 in 1999 to 14 per 100,000 in 2017, CNN reported.

American Indian or Alaska Natives had the highest increase among all racial/ethnic groups, according to the findings released Thursday by the Centers for Disease Control and Prevention’s National Center for Statistics.

There were significant increases in suicide deaths among girls and women in all racial/ethnic groups except Asian or Pacific Islander. The largest increase (139 percent) was among American Indian or Alaska Native girls and women, CNN reported.

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