 The largest contributor to Kigali's gross domestic product is the service sector, but a significant proportion of the population works in agriculture including small-scale subsistence farming.Attracting international visitors is a priority for city authorities, including leisure tourism, conferences and exhibitions.The earliest inhabitants of what is now Rwanda were the Twa, a group of aboriginal pygmy hunter-gatherers who settled the area between 8000 and 3000 BC and remain in the country today.