Passage: The presidency passed to the sitting Vice-President, Quett Masire, who was elected in his own right in 1984 and re-elected in 1989 and 1994. Masire retired from office in 1998. He was succeeded by Festus Mogae, who was elected in his own right in 1999 and re-elected in 2004. The presidency passed in 2008 to Ian Khama (son of the first President), who had been serving as Mogae's Vice-President since resigning his position in 1998 as Commander of the Botswana Defence Force to take up this civilian role.

Question: When did Masire retire from office?
1998