听力原文： On the 20th anniversary of the first official report on AIDS, the head of the United Nations AIDS Program warns the deadly disease may only be at its early stages in many parts of the world. Dr. Peal said the disease has already reached staggering proportions since first being identified in 1981. 58,000,000 people worldwide have contracted HIV virus which causes AIDS, while 22,000,000 have died from related illnesses. The UN estimates the world HIV positive population at 36,000,000, including 25,000,000 in sub-Sahara in Africa. International officials warn the disease would have disastrous political, social and economical consequences in many developing countries. According to the report, how many people are HIV-positive?