Despite widespread safety campaigns and harsher penalties for not abiding to seatbelt laws, a new study has found that more than two thirds of all teenagers killed in vehicle accidents at night were not wearing a seatbelt. Though seatbelt use in the U.S. is rising slowly – 82% last year, up from 81% in 2006 – 68% of drivers and passengers between the ages of 16 and 20 who were killed in car crashes at night during 2006 were unbuckled.

The findings come from a new report published by the National Highway Traffic Safety Administration (NHTSA), which only focused on 2006 data. Researchers explain that since most fatal accidents occur at night, alcohol is often a factor. They also state that seatbelt use is lower at night than during the day for the same age groups.

The problem isn’t just with teens. The percentage of unbuckled drivers and passengers involved in fatal accidents is above the 60% mark up until the age of 44. It declines to 52% for people 55-64 and 41% for those older than that.