Economy Borgartún is the financial centre of Reykjavík, hosting a large number of companies and three investment banks. Reykjavík has been at the centre of Iceland's economic growth and subsequent economic contraction over the 2000s, a period referred to in foreign media as the "Nordic Tiger" years, or "Iceland's Boom Years". The economic boom led to a sharp increase in construction, with large redevelopment projects such as Harpa concert hall and conference centre and others. Many of these projects came to a halt in the following economic crash of 2008. Infrastructure Roads Per capita car ownership in Iceland is among the highest in the world at roughly 522 vehicles per 1,000 residents, though Reykjavík is not severely affected by congestion. Several multi-lane highways (mainly dual carriageways) run between the most heavily populated areas and most frequently driven routes. Parking spaces are also plentiful in most areas. Public transportation consists of a bus system called Strætó bs. Route 1 (the Ring Road) runs through the city outskirts and connects the city to the rest of Iceland. Airports and seaports Reykjavík Airport, the second largest airport in the country (after Keflavík International Airport), is positioned inside the city, just south of the city centre. It is mainly used for domestic flights, as well as flights to Greenland and the Faroe Islands. Since 1962, there has been some controversy regarding the location of the airport, since it takes up a lot of valuable space in central Reykjavík. Reykjavík has two seaports, the old harbour near the city centre which is mainly used by fishermen and cruise ships, and Sundahöfn in the east city which is the largest cargo port in the country. Railways There are no public railways in Iceland, because of its sparse population, but the locomotives used to build the docks are on display. Proposals have been made for a high-speed rail link between the city and Keflavík. District heating Volcanic activity provides Reykjavík with geothermal heating systems for both residential and industrial districts. In 2008, natural hot water was used to heat roughly 90% of all buildings in Iceland. Of total annual use of geothermal energy of 39 PJ, space heating accounted for 48%. Most of the district heating in Iceland comes from three main geothermal power plants: Svartsengi combined heat and power plant (CHP) Nesjavellir CHP plant Hellisheiði CHP plant Cultural heritage Safnahúsið (the Culture House) was opened in