Discussion
The sum of percentage of applications received by the top three rank countries is more than the sum of percentage of applications received by the remaining countries in the table, in number of years:
Answer: D
The top three countries never out-weigh the rest, so the answer is None of these: it happens in 0 years.
Add up each year's column and take the three largest shares:
\[ \begin{aligned} 2007 &: \text{all } 86,\ \text{top three } 15 + 11 + 9 = 35 \\ 2008 &: \text{all } 87,\ \text{top three } 13 + 10 + 9 = 32 \\ 2009 &: \text{all } 89,\ \text{top three } 13 + 11 + 9 = 33 \\ 2010 &: \text{all } 92,\ \text{top three } 15 + 13 + 11 = 39 \\ 2011 &: \text{all } 93,\ \text{top three } 17 + 12 + 10 = 39 \end{aligned} \]
The remaining twelve countries hold 51, 55, 56, 53 and 54, which is more than the top three every year. So the number of years is zero, which is not offered as 1, 2 or 3.
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