public static function perMonth($months = 1, $date_format = "Y-m")
    {
        
        $hits_per_month = [];

        for ($i = 1; $i <= $months; $i++) {
            $hits_count = self::interval(Carbon::now()->subMonths($i)->firstOfMonth(), Carbon::now()->subMonths($i)->lastOfMonth());

            $hits_per_month[Carbon::now()->subMonths($i)->format($date_format)] = $hits_count;
        }

        return $hits_per_month;

    }