 Kampala's metropolitan area consists of the city proper and the neighboring Wakiso District, Mukono District, Mpigi District, Buikwe District and Luweero District.It has a rapidly growing population that is estimated at 6,709,900 people in 2019 by the Uganda Bureau of Statistics in an area of .In 2015, this metropolitan area generated an estimated nominal GDP of $13.80221 billion (constant US dollars of 2011) according to Xuantong Wang et al., which was more than half of Uganda's GDP for that year, indicating the importance of Kampala to Uganda's economy.