Metro Manila is the most populous of the 3 defined metropolitan areas in the Philippines and the 5th most populous in the world. Census data from 2015 showed it had a population of 12,877,253 constituting almost 13% of the national population. Including suburbs in the adjacent provinces (Bulacan, Cavite, Laguna, and Rizal) of Greater Manila, the population is around 23,088,000. Across the country, the Philippines has a total urbanization rate of 51.2 percent. Metro Manila's gross regional product was estimated  to be ₱468.4 billion (at constant 1985 prices) and accounts for 33% of the nation's GDP. In 2011 Manila ranked as the 28th wealthiest urban agglomeration in the world and the 2nd in Southeast Asia.