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Explanation:

There is an increase in imports in only two years.

Increase in imports in 2006 = $\left(\frac{45}{225}\right)$ × 100 = 22.22%

Increase in imports in 2010 = $\left(\frac{25}{175}\right)$ × 100 = 14.28%

So the second highest percentage increase will be in the year 2010.

Hence, option (a).