public function getExecutionTimeProportion()
    {
        if ($this->getExecutionTime() && $this->getProcess()->getAvgExecutionTime()) {
            return round($this->getExecutionTime() / $this->getProcess()->getAvgExecutionTime(), 2);
        } elseif ($this->getExecutionTime()) {
            return $this->getExecutionTime();
        } elseif ($this->getProcess()->getAvgExecutionTime()) {
            return 0;
        } else {
            return 1;
        }
    }