 Children between birth and 17 years of age have a below-average share of the total, with 39.6 per cent against 47.7 per cent nationally.These differences are attributed by the National Institute of Statistics of Rwanda (NISR) to the migration of working-age Rwandans from rural to urban areas.Similarly, Kigali has a lower level of over-60s, with 2.6 per cent, than the Rwanda average of 4.9 per cent, also likely reflecting the tendency for non-working-age inhabitants to live rurally.