 Complete the following phrase:  Construction of an oil refinery began in 1964 and it opened in 1967. By 1989, Assab had a population of 39,600 inhabitants. The port facilities were greatly expanded in the early 1990s, with the construction of a new terminal. The oil refinery was shut down for economic reasons in 1997. Ethiopia used Assab as the port for two-thirds of its trade with the world until the 