\(\begin{array}{c|c}
& \text{Year 1} & \text{Year 2} \\
\hline
\text{GNP at current prices(NM)} & 20,000 & 27,000 \\ \hline
\text{Population(Million)} & 20 & 24 \\
\end{array}\)
What is the percentage increase in GNP between year 1 and year 2?