The Migration Policy Institute, a Washington think tank, and researchers from the University of Hawaii at Manoa, are recommending that Mexico's government open a permanent consulate in Hawaii to serve a small but growing population. That recommendation was included in a study presented today that said people of Mexican origins in Hawaii have different experiences on the islands than in the other U.S. states.  The study says people of Mexican origin make up about three percent of Hawaii's overall population, with 38,700 people.  The biggest jump in the past decade has been on the Big Island, where the population of Mexicans and Mexican-Americans grew 85 percent since 2000. The study says a permanent consulate would make it easier for Mexican nationals to access services and act as an intermediary between the Mexican community and state and federal government.