BISMARCK, N.D. (AP) — Hate crimes in North Dakota appeared to drop for the second straight year in 2016, but authorities warn against making year-by-year comparisons because the number of participating agencies changes each year.

The FBI released its 2016 hate crime statistics report Monday.

North Dakota reported eight hate crimes last year. The figures come from just six — roughly 3 percent — of the 180 agencies that participated in the hate crime statistics program.

The figures are a big drop from 2015, when the state reported 36 hate crimes. That year, nearly 17 percent of participating police agencies reported incidents.

The yearly report is the most comprehensive accounting of hate crimes in the U.S. But authorities warn it's incomplete, partly because it's based on voluntary reporting by police agencies.