 The 2010 census found 18,659 residents, down 1.8 percent from the 2000 census, while the 2011 estimate put the population at 18,440, a drop of another 1.2 percent since 2010.The poverty rate increased to 27.5 percent of the population.The proportion of the population that is white remained at 79.5 percent, while the Hispanic proportion more than doubled to 2.4 percent as the black population dropped to 15.9 percent.