public function getReportingRateTrendAction()
{
$year = $this->_request->getParam('year', '');
$month = $this->_request->getParam('month', '');
$province = $this->_request->getParam('province', '');
$district = $this->_request->getParam('district', '');
$geoModel = new Model_Geo();
$return = $geoModel->getReportingRateTrend($year, $month, $district);
echo Zend_Json::encode($return);
}