According to the CIA and the Central Bank of Somalia, despite experiencing civil unrest, Somalia has maintained a healthy informal economy, based mainly on livestock, remittance/money transfer companies and telecommunications. Owing to a dearth of formal government statistics and the recent civil war, it is difficult to gauge the size or growth of the economy. For 1994, the CIA estimated the GDP at $3.3 billion. In 2001, it was estimated to be $4.1 billion. By 2009, the CIA estimated that the GDP had grown to $5.731 billion, with a projected real growth rate of 2.6%. According to a 2007 British Chambers of Commerce report, the private sector also grew, particularly in the service sector. Unlike the pre-civil war period when most services and the industrial sector were government-run, there has been substantial, albeit unmeasured, private investment in commercial activities; this has been largely financed by the Somali diaspora, and includes trade and marketing, money transfer services, transportation, communications, fishery equipment, airlines, telecommunications, education, health, construction and hotels. Libertarian economist Peter Leeson attributes this increased economic activity to the Somali customary law (referred to as ''Xeer''), which he suggests provides a stable environment to conduct business in.