At 1000 K, the linear thermal expansion coefficients of graphite, parallel and perpendicular to the graphite layers, are \( 0.8 \times 10^{-6} \, \text{K}^{-1} \) and \( 29 \times 10^{-6} \, \text{K}^{-1} \), respectively. The percentage increase in the volume of graphite when heated from 900 K to 1100 K is \(\underline{\hspace{2cm}}\) (round off to 2 decimal places).
