A single-phase inverter is fed from a $100 \: V$ dc source and is controlled using a quasi-square wave modulation scheme to produce an output waveform, $\nu\left ( t \right )$, as shown. The angle $\sigma$ is adjusted to entirely eliminate the $3^{rd}$ harmonic component from the output voltage. Under this condition, for $\nu\left ( t \right )$, the magnitude of the $5^{th}$ harmonic component as a percentage of the magnitude of the fundamental component is _____________ (rounded off to $2$ decimal places).