Using highcharts with Drupal 7

mymodule.js

(function ($) {
  Drupal.behaviors.mymodule_charts = {
    attach:function () {
      if (Drupal.settings.mymodule.charts) {
        for (var chart in Drupal.settings.mymodule.charts) {
          new Highcharts.Chart(Drupal.settings.mymodule.charts[chart]);
        }
      }
    }
  };
})(jQuery);

mymodule.module

<?php

/**
 * Page callback
 */
function mymodule_stats() {
  drupal_add_js(drupal_get_path('module', 'mymodule') . '/highcharts.js');
  drupal_add_js(drupal_get_path('module', 'mymodule') . '/mymodule.js');

  // Charting
  $id = 'mychart';
  $settings = array(
    'chart' => array(
      'renderTo' => 'chart-' . $id,
    ),
    'xAxis' => array(
      'categories' => array(1, 2, 3, 4, 5, 6, 7, 8, 9),
    ),
    'title' => array(
      'text' => 'Some title',
    ),
    'series' => array(
      array(
        'name' => 'Data label',
        'data' => array(1, 3, 7, 5, 6, 8, 9, 2, 3, 6),
      ),
    ),
    'credits' => array(
      'enabled' => FALSE,
    ),
  );
  drupal_add_js(array(array('charts' => array($id => $settings)), 'setting');
  $content .= '<div id="chart-'. $id .'"></div>';

  return $content;
}

Hello,
I need some help I want to build a chart from only one content Type with many author and sort by Autor for each Year. I'm using Hightchart with drupal but the result I get is not good. So can I have your advise?
CT (Statisitque) - Fields [Value(Integer), Date(Month & Year), Author()]