The capital Nonthaburi and Pak Kret have city ("thesaban nakhon") status. Further seven have town ("thesaban mueang") status and eleven subdistrict municipalities ("thesaban tambon"). The non-municipal areas are administered by 25 Subdistrict Administrative Organizations - SAO ("ongkan borihan suan tambon"). Nonthaburi Province is renowned for growing the best durians in the country. Durian has been a well-known fruit in this province for 400 years. The fruit is known as "Durian Non" which means durian from Nonthaburi Province. It is also known as the most expensive durian in the world. There are six groups of Nonthaburi durian which are Kop, Luang, Kan Yao, Kampan, Thong Yoi, and miscellaneous. Most durian orchards are near rivers such as the Chao Phraya. This is because the soil next to the river is good for planting which is also good for durian trees. Many durian orchards have disappeared due to flooding and pollution. The price of durian Non depends on its group. Kan Yao is the most expensive, starting from around 10,000 baht up to 20,000 baht (or about US$600) for one durian. The Kan Yao itself is not easy to find in normal markets. The main reason for the high price is because it is rare. The recent flood in 2011 cleared out almost all of the durian trees in Nonthaburi, and only a few trees have been newly planted. Also, residential areas are expanding into agricultural areas. Nonthaburi's main hospital operated by the Ministry of Public Health is Phra Nang Klao Hospital. It is also the location of the largest psychiatric hospital in Thailand- Srithanya Hospital. Since 2003, United Nations Development Programme (UNDP) in Thailand has tracked progress on human development at sub-national level using the Human achievement index (HAI), a composite index covering all the eight key areas of human development. National Economic and Social Development Board (NESDB) has taken over this task since 2017. Reports (data) from Thai government are "not copyrightable" (Public Domain), Copyright Act 2537 (1994), section 7.