from North Sumatra, particularly the Medan and West Sumatra regions have moved to Pekanbaru due to opportunities and rapid economical growth in the area since the 1990s and 2000s. Administrative districts The city is divided into fifteen administrative districts, formerly twelve (Indonesian: kecamatan), tabulated below with their areas and their populations. The table also includes the number of administrative urban villages (kelurahan) in each district. There are no data for the individual area of Tuah Madani and Binawidya, as both districts previously fell under the same district of Tampan. Together, both districts comprise 59,81 km2. Climate Pekanbaru has a tropical rainforest climate under the Köppen climate classification. As with many cities with an equatorial climate, the temperature only varies a little throughout the year. The hottest month is May with average temperature , while the coolest month is January with average temperature . The precipitation accumulation also remains constant throughout the year with no real dry season. The month with most precipitation is November with precipitation total , while the least precipitation is July with precipitation total . Economy After oil was discovered in the region in the 1930s, Pekanbaru's economy has depended heavily on oil revenues which caused the city to have the highest per capita income in Indonesia. Most of Indonesia's petroleum is produced in Riau, and much of Pekanbaru's economy is based on the petroleum industry. International oil companies, prominently Chevron from the US, as well as other Indonesian companies, have established their offices in the region. The city is connected by road to an oil refining and exporting port in Dumai. Many facilities and infrastructures such as an airport, stadiums, housing areas, schools, bridges that cross the Siak River in Pekanbaru, the roads in Rumbai and the roads to Dumai, were partially or fully financed by oil companies in the area. Pekanbaru is really close with some of the home of mega-companies, such as PT Riau Andalan Pulp Paper, PT. Indah Kiat, PT. Chevron Pacific Indonesia, and PT Perkebunan Nusantara V and some wood-sawmill, CPOs, and rubber-processing companies, and Pekanbaru is often said to be one of the cities with the highest money and banking rotation in Indonesia. As Pekanbaru is prominently known as a major gateway for tourists from Singapore and Malaysia, the city has become a favourite stop-over for travellers before they go further inland to other regions of Sumatra Island such as Padang