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The number of people attending the party is 163 - 9 = <<163-9=154>>154 people.
Since each table seats 12 guests, the number of tables needed to seat all the guests is ceil(154/12) = ceil(12.833333) = <<ceil(12.833333)=13>>13.
Therefore, the fewest number of tables needed is 13. Answer: \boxed{13}.