public function customers()
{
$charts = array();
foreach (InvoiceItem::TotalCountPerMonth()->WithoutStakeholders()->byKind()->get() as $item) {
$charts[$item->kind ? $item->kind : self::LABEL_OTHERS][$item->period] = $item->total;
}
foreach ($charts as $name => $chart) {
ksort($charts[$name]);
}
return View::make('stats.ca', array('charts' => $charts));
}