In 1966, the population served was estimated to be 27,000 and 40 years later, in 2007, the population served was estimated to be more than 200,000.
In 1966, the population served was estimated to be 27,000 and 25 years later, in 1991, it had quadrupled to more than 144,000. In 2007, the population served was estimated to be more than 200,000.