Complete the berlinWall0 function, so that given a year as a parameter, the function returns how many years it will have been at the end of the given year since the fall of the berlin wall. The given year will always be 1989 or greater. (NOTE: The Berlin wall fell November 9, 1989).
berlinWall0(2001) → 12
berlinWall0(1990) → 1
berlinWall0(1989) → 0
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