readPercentage( chunk ) {

		const subChunk = chunk.readChunk( );

		switch ( subChunk.id ) {

			case INT_PERCENTAGE:
				return ( subChunk.readShort( ) / 100 );
				break;

			case FLOAT_PERCENTAGE:
				return subChunk.readFloat( );
				break;

			default:
				this.debugMessage( '      Unknown percentage chunk: ' + subChunk.hexId );
				return 0;

		}

	}
Read percentage value.

@private
@param {Chunk} chunk - Chunk to read data from.
@return {number} Data read from the dataview.