private function monthlyComparison($metrics = 'ga:users')
    {
        $thisMonth = $this->monthlySummary($metrics);
        $lastMonth = $this->monthlySummary($metrics, '-month_1');

        return json_response([
            'month'      => [
                'value'     => $thisMonth,
                'color'     => "#00c0ef",
                'highlight' => "#00a7d0",
                'label'     => "Current"
            ],
            'last_month' => [
                'value'     => $lastMonth,
                'color'     => "#00a65a",
                'highlight' => "#008d4c",
                'label'     => "Previous"
            ]
        ]);
    }