Batangas has an estimated population of as of 2015. It is the second most populous (after Calabarzon) and most densely populated region in the Philippines, the 7th most populous metropolitan area in Asia, and the 4th most populous urban area in the world. The most populous cities in Metro Manila are Quezon City (2,960,048), Manila (1,846,513), Caloocan (1,661,584), Taguig (886,722), Pasig (803,159), Valenzuela (714,978), Parañaque (689,992) Las Piñas (606,293), Makati (629,616) and Muntinlupa (543,445). Poverty, housing and urban slums From the 1980s up to the present, informal settlers have accounted for roughly one-third of the Metro Manila population. A majority of informal settlers belong to the middle-class. In 2014, there are an estimated four million slum dwellers living in Metro Manila. Homelessness is also a major problem in Metro Manila. However, these are being addressed by creating in-city relocation housing, and by relocating informal settler families in low-density housing built in the nearby provinces of Batangas, Bulacan, Cavite, Laguna and Rizal. During the American occupation, housing policies in Manila dealt the problem of sanitation and concentration of settlers around business areas. Among those implemented were business codes and sanitation laws in slum areas in the 1930s. During this period and until the 1950s, new communities were opened for relocation. Among these were Projects 1–8 in Diliman, Quezon City and the Vitas tenement houses in Tondo. The government implemented the Public Housing Policy in 1947 that established the People's Homesite and Housing Corporation (PHHC). A few years later, it put up the Slum Clearance Committee which, with the help of the PHHC, relocated thousands of families from Tondo and Quezon City to Sapang Palay in San Jose del Monte, Bulacan in the 1960s. During the time of President Ferdinand Marcos, the World Bank and the Asian Development Bank supported the programs for the "development of relocation" and "on-site development." Carmona and Dasmariñas in Cavite and San Pedro in Laguna opened as relocation sites. Along with the establishment of the National Housing Authority (Philippines), Presidential Decree 772 made squatting a crime, making the Philippines one of only two countries (the other is South Africa) where squatting is a crime. The government formulated the National Shelter Program which became the over-all framework for dealing with housing needs of all income classes. Imelda Marcos held both the position as Governor of Metro Manila and as Minister of Human Settlements and Ecology or MHSE until