protected function getMonthyChartData()
{
if (!$this->monthly_data) {
$this->monthly_data = $this->getData($this->monthly_file);
}
$labels = [];
$data = [];
foreach ($this->monthly_data as $date => $count) {
$labels[] = date('M', strtotime($date));
$data[] = $count;
}
return ['labels' => $labels, 'data' => $data];
}