Kigali young, with 73 percent of residents being less than 30 years old, and 94 percent under the age of 50. In 2014, the proportion of people classified as living in poverty within Kigali was 15 percent, compared with 37 percent for Rwanda as a whole. The 2012 census recorded a workforce of 487,000 in Kigali. The city's biggest employment sector is agriculture, fishing and forestry, covering 24 percent of the workforce; utilities and financial services with 21 percent; trade 20 percent and government 12 percent. Mines for tin ore (cassiterite) have operated nearby, and the city built a smelting plant
Kigali act as a water store and flood protection for the city, although these are under threat from agriculture and development. The central business district (CBD) (known in Kinyarwanda as "mu mujyi") of Kigali lies on Nyarugenge Hill, and was the site of the original city founded by Richard Kandt in 1907. The house that Kandt lived in is now a museum. Geographically, the CBD lies towards the western edge of the built-up area, as the terrain to the east was more suitable for development of the expanding city than the high slopes of Mount Kigali to the west. Several of