Groupe Eurotunnel truck and passenger shuttle traffic fell in the seven months to the end of July.
In July 2017, Le Shuttle Freight transported 136,293 trucks - 1% down on a year ago.
Since 1 January, Le Shuttle Freight has transported 959,440 trucks compared with 966,697 in the corresponding period last year.
Passenger vehicle traffic in July was 5% lower than a year ago, with 304,653 vehicles transported.
The group said this reflected the double impact of the final stages of the Euro 2016 Football Championship and the biennial Le Mans Classic both taking place in France in July last year.
Since 1 January 2017, Le Shuttle Passenger traffic has decreased by 3% with 1,470,454 vehicles transported.