A southeastern state had 573 highway fatalities last year where the person killed was not wearing a seat belt even though they had access to one. This year, all law enforcement agencies in the state stressed the importance of wearing a seat belt through education and by stepping up enforcement of the state law requiring seat belt usage. The result of these efforts was a decrease of 12% in non-seat belt usage fatalities this year. How many highway fatalities were there this year where the person was not wearing a seat belt?