Crowley Maritime Corp. will add sailings between Pennsauken, N.J., and San Juan, Puerto Rico, this summer. The move comes in response to customers’ needs for additional service in the Northeast, according to a company statement.

The 580-series, triple-deck Ro/Ro barge capable of carrying 345 loads will alternate between the South Atlantic and North Atlantic services, and generate one southbound and one northbound sailing each month between Pennsauken and San Juan.

Trade between Puerto Rico and the mainland has been on the rise this year. Puerto Rico’s exports to the U.S. mainland, mostly pharmaceuticals and medical devices, increased 11.2 percent increase in 2014 and are slated to go higher this year, government data.

Total exports to the U.S. mainland were $49.1 billion in 2014, $5 billion more than in 2013, and the highest since 2010. The second half of 2014 showed double-digit increases every month. The latest available monthly export numbers, from February, showed an 18.4 percent increase year over year. Imports have increased slightly, up by $500 million from 2013 to $20.8 billion in 2014.

Earlier this year, Crowley added a vessel to its Jacksonville-to-San Juan service, inceeasing those sailings to four times a week.