Connecticut saw a decline in drunk-driving fatalities in 2014, but the state still ranks among the highest in the country in the percentage of traffic deaths involving alcohol-impaired drivers, new federal data show. Ninety-seven of the 248 traffic fatalities in Connecticut, or 39 percent, involved drivers with a blood-alcohol content (BAC) of .08 or higher, considered alcohol-impaired, according to statistics compiled by the National Highway Traffic Safety Administration (NHTSA). That rate is higher than the U.S. average of 31 percent, and is the fifth highest nationally — behind Texas, North Dakota and Massachusetts, with rates of 41 percent, and Delaware, at 40 percent. Vermont had the lowest rate, at 20 percent. Total motor vehicle deaths in Connecticut declined from 276 in 2013 to 248, in line with a national trend.