public function getMemPercentApplication()
    {
        if ($this->_memApplication !== null) {
            if (($this->_memApplication > 0) && ($this->_memTotal > 0)) {
                return round($this->_memApplication / $this->_memTotal * 100);
            } else {
                return 0;
            }
        } else {
            return null;
        }
    }