They included those for government departments, including a National Parliament Building, which was opened in 1984 by Prince Charles and blends traditional design with modern building technology. The Papua New Guinea National Museum and National Library are in Waigani. A mansion was built in Port Moresby just west of the old legislative building but the last pre-independence chief minister and first prime minister of the sovereign state declared it not nearly grand enough; it was made the residence of Australian high commissioners and a mansion suitable to Somare's demands was built in Waigani. Several of the government buildings have been abandoned due to long-term neglect. Chief amongst these are Marea Haus (known to most locals as the "Pineapple Building") and the Central Government Offices. Nearby buildings, such as Morauta Haus and Vulupindi Haus, are starting to show significant signs of decay due to a lack of maintenance. However, widespread restoration rather than demolition of long-disused office buildings has been highly active since the first decade of the 21st century. The legislative building before independence and the first parliament building is long-gone but the old court house in town Port Moresby remains, bearing its pre-independence label with its previous title. The population of the Port Moresby area expanded rapidly after independence. In 1980, the census return registered a population of 120,000; by 1990, this had increased to 195,000. Moresby has a tropical savanna climate (Köppen: "Aw") with relatively constant temperatures throughout the year. Port Moresby's average yearly rainfall is just over , making it the driest place in New Guinea. The wet season starts in December and ends in May; the dry season covers the remaining six months. This is due to the south easterly trade winds running parallel to the coast, and the city being surrounded by high mountains. The average high temperatures range from depending on time of year, while the average low temperature shows very little seasonal variation, hovering around the mark. It tends to be slightly cooler in the city during the dry season. Port Moresby is the single district of the National Capital District, which contains three Local Level Government (LLG) areas. For census purposes, the LLG areas are subdivided into wards and those into census units. The National Capital District machinery of government also incorporates the Motu Koita Assembly, established by an act of parliament to represent the traditional landowners of Port Moresby, the Motu and Koitabu people.