Study the following table carefully to answer the questions given below:
Sum of all mild in the given years = Sum of (percentage normal * Total surveyed number)
=3% * 18000 + 3.8% * 2410 + 3.4% * 1721 + 10.6% * 6775 + 14.3% * 4713 + 14.8% * 4008 + 16.5% * 9180 = 4190
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