 The NISR does not maintain detailed economic data for subnational entities in Rwanda, but economists have used various measures to estimate the city's output.A 2015 working paper by the World Bank Policy Research unit used the amount of light visible at night in different regions as a proxy for relative gross domestic product (GDP), and found that the three districts of Kigali represented 42% of Rwanda's total night-light output.When translated, this gives a total city GDP of approximately US$1.8 billion or $1,619 per capita, compared with a national average of $436 per capita.