I want to know the answer to the following question:
What organization did Libya join in 1999?
All the background I'm provided with is that "He became one of the founders of the African Union (AU), initiated in July 2002 to replace the OAU; at the opening ceremonies, he proclaimed that African states should reject conditional aid from the developed world, a direct contrast to the message of South African President Thabo Mbeki.". Is that enough to answer the question?