 Other major towns include Ruhengeri, Butare, and Muhanga, all with populations below 100,000.The urban population rose from 6% of the population in 1990, to 16.6% in 2006; by 2011, however, the proportion had dropped slightly, to 14.8%.Rwanda has been a unified state since pre-colonial times, and the population is drawn from just one cultural and linguistic group, the Banyarwanda; this contrasts with most modern African states, whose borders were drawn by colonial powers and did not correspond to ethnic boundaries or pre-colonial kingdoms.