Alcohol-related traffic fatalities fell slightly in the U.S. last year, but trends varied from state to state, the Associated Press reported Aug. 20.

Drunk-driving deaths fell in 28 states plus the District of Columbia and Puerto Rico, but increased in 22 states, according to the National Highway Traffic Safety Administration (NHTSA). A total of 13,470 people died in crashes involving drivers with a blood-alcohol content of .08 percent or higher in 2006, down from 13,582 in 2005.

However, more people died in crashes where drivers had any detectable level of alcohol in their bodies, NHTSA reported.

The number of drunk-driving deaths rose the most in Arizona, Kansas and Texas, while Utah, Kansas and Iowa had the biggest percentage increases. Florida, Missouri and Pennsylvania experienced the greatest number decline in drunk-driving deaths, while the largest percentage decreases were reported in the District of Columbia, Alaska, and Delaware.