According to that Wikipedia article, kiloton-range bolides (airburst meteors) typically occur on Earth more than once per year.
A stony meteoroid of about 10 metres (30 ft) in diameter can produce an explosion of around 20 kilotons, similar to that of the Fat Man bomb dropped on Nagasaki, and data released by the U.S. Air Force's Defense Support Program indicate that such explosions occur high in the upper atmosphere more than once a year.
http://en.wikipedia.org/wiki/Tunguska_event
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According to that Wikipedia article, kiloton-range bolides (airburst meteors) typically occur on Earth more than once per year.
A stony meteoroid of about 10 metres (30 ft) in diameter can produce an explosion of around 20 kilotons, similar to that of the Fat Man bomb dropped on Nagasaki, and data released by the U.S. Air Force's Defense Support Program indicate that such explosions occur high in the upper atmosphere more than once a year.