Problem with getting User List for my Plugin

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Loader::model('user_list');
$userList = new UserList(); 
$userList->sortBy('uName', 'asc'); 
  if ($userList->getTotal() == 0) {  } else {
      $users = $userList->get();
      /*
      echo "<pre>";
      print_r($users);
      echo "</pre>";
      */
   }


UserList->getTotal() only return 99 Users ... although API says it should return all.