HAGATNA, Guam (AP) — Inspectors so far this year have intercepted at least 60 pounds (27 kilograms) of methamphetamine mailed to Guam, a U.S. Postal Service official said.

Kevin Rho, assistant inspector with the Postal Service, said the amount of meth sent to Guam through the mail has increased during the past 10 years, the Pacific Daily News reported .

Despite the uptick, the Postal Service does not plan to add another inspector on the U.S. territory, Rho said.

"To dedicate two full-time inspectors just for Guam is a huge undertaking for us," Rho said, adding that the agency is small, with about 1,400 inspectors nationwide.

The cost of methamphetamine in the mainland is considerably less than what it is selling for on Guam, Lt. Gov. Ray Tenorio said.

Rho estimated a gram of meth in California sold for between $60 to $80, while Customs officials said a gram on Guam is estimated to cost between $200 and $400.

Investigations are ongoing in connection with the confiscated drugs, and arrests are pending, Rho said.

The U.S. Drug Enforcement Administration stated in its 2016 National Drug Threat Assessment Summary that crystal methamphetamine and marijuana are Guam's "two principal drugs of choice."