The tourism industry, developed with government help in the early 1970s, has been negligible since 1979 due to internal political instability. A passport and visa are required for entrance into Afghanistan. In 1999, the UN estimated the daily cost of staying in Kabul at $70. Approximately 61% of these costs were estimated to be the price of a room in a guest house. As travel was highly restricted in the country due to the US-led campaign against the Taliban and al-Qaeda, it is unknown what the daily cost of staying in the country was in 2002.