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Explanation:

The following table can be constructed on the basis of the data given:

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From the table,

Increase in exports in 2003 = $\left(\frac{40}{110}\right)$ × 100 = 36.36%

Increase in exports in 2005 = $\left(\frac{50}{150}\right)$ × 100 = 33.33%

Increase in exports in 2007 = $\left(\frac{25}{175}\right)$ × 100 = 14.28%

Increase in exports in 2008 = $\left(\frac{75}{200}\right)$ × 100 = 37.50%

Increase in exports in 2010 = $\left(\frac{60}{200}\right)$ × 100 = 30.00%

So the fifth highest percentage increase will be in the year 2007.

Hence, option (a).