Has Lake Chad always been approximately the same size?

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Lake Chad was formerly even larger, attaining a depth of c.930 ft (285 m) in the 19th cent.; 60,000 years ago, it covered 150,000 sq mi (388,500 sq km), roughly the size of the Caspian Sea. The lake also has been much smaller than it was in the mid-20th cent., and probably has previously disappeared ...