public function queryHistoricStats(array $parameters)
    {
        $uri = $this->_getHistoricalEndpoint()
            . '?region='.$parameters['region']
            . '&from='.$parameters['from']
            . '&to='.$parameters['to']
            . '&by='
            . $parameters['sample_rate'];

        $result = $this->_fetch($uri);

        return $result;
    }