Please answer a question about the following article about San Diego:

The city shares a 15-mile (24 km) border with Mexico that includes two border crossings. San Diego hosts the busiest international border crossing in the world, in the San Ysidro neighborhood at the San Ysidro Port of Entry. A second, primarily commercial border crossing operates in the Otay Mesa area; it is the largest commercial crossing on the California-Baja California border and handles the third-highest volume of trucks and dollar value of trade among all United States-Mexico land crossings.

What is the volumte of trucks handled at the Otay Mesa crossing?
the third-highest volume of trucks and dollar value of trade among all United States-Mexico land crossings.