Rørdal Fabriksby, Øster Sundby, and Øster Uttrup into Aalborg. In 1950, it reached 87,883, which grew to 100,587 by 1970. There was a temporary decline in population to 94,994 in 1976 but in 1981, following the incorporation of Nørresundby, it grew to 114,302. The population has increased steadily since then; according to the census of 1 January 2009, Aalborg had a total of 122,461 inhabitants, 101,497 of them living in the town and 20,964 in the independent suburb of Nørresundby. , the town had a total population of 142,561 (118,871 in the city proper and 23,690 in Nørresundby) making it the fourth most populous in Denmark after Copenhagen, Aarhus, and Odense. Statistics for 2016 showed there were 210,316 people living in the Municipality of Aalborg. Economy Aalborg is North Jutland's major industrial and commercial centre, exporting grain, cement, and spirits. Heavy industry was behind the city's prosperity until fairly recently. Many of the factories have now closed, to be replaced by developments in the knowledge-based and green-energy sectors. Mobile and wireless communications industries have grown substantially since the 1990s, as has rotor production for wind turbines. In January 2011, there were some 9,200 enterprises in Aalborg, employing around 109,000 people or approximately 35% of the workforce of the Northern Region. In the 2010s, the city is set on increasing its participation in the global economy through both existing companies and new entrants. Its efforts are focused on four areas: energy and environment, information technology, health support systems and "Arctic business". The latter covers trade with Greenland as the Port of Aalborg handles over 60% of all goods shipped to Greenland. Four harbours dot the waterfront, Marina Fjordparken, Skudehavnen, Vestre Badehavn, and Østre Havn. Tourism is also growing, with a considerable rise in the number of passengers at Aalborg Airport. Aalborg Municipality has Denmark's second highest revenue from tourism and is the only municipality in the north of Denmark where overnight stays are increasing. Major private companies Telenor Denmark, part of the Norwegian Telenor telecommunications and mobile phone company, has a workforce of about 1,100 in Aalborg, making it one of the city's largest new employers. Siemens Wind Power has rotor-blade production and testing facilities in Aaborg. In 2012 and 2013, there were additions in both areas. The new testing plant is the world's largest research test centre for wind turbine technology. In 2012, the company shipped a record 570 wind