Data released by the Panama Maritime Authority (AMP) shows nearly 2.22 million net barrels of marine fuels sold during the month.
That compares to 1.62 million in the same month of 2014.
It was the fifth-straight month of year-over-year gains.
Still, the month's performance marks a slight decline compared to July 2015, when the country sold 2.25 million barrels.
