Just for your information:
I would also like to know the amount of domain referers.
For example google.nl: 4433 times instead of hundreds of referers with several parameters or search terms.
To accomplise, I added the following in de file index.php at line 1126 just below:
<div class="changetab page-break" id="tab4">
  ';
}




// Added in version 3.6.22, index.php, line 1126
     echo '
  <table border="0" width="100%" cellspacing="0" cellpadding="0">
  <tr>
    <td align="center" valign="top">
    ';
     foreach ($referer as $key => $value)
          {
           $refererPieces = explode("/", $key);
           $refererPiecesStrip = str_replace("www.", "", $refererPieces[2]);
          $refererDomains[$refererPiecesStrip] += $value;
           }
    //--------------------------------
    if ( ( $display_show_referer != 0 ) && ( count ( $referer ) >= 1 ) )
    {
     $max_value = array_sum ( $refererDomains );
      arsort  ( $refererDomains );
     display ( "<div class=\"stat_user\">".$lang_referer[3]."</div>" , $lang_referer[2] , $lang_module[1] , $lang_module[2] , $refererDomains , $display_width_referer , $display_count_referer , $lang_module[3] , $delete_year , $max_value , "referer" , 0 );
     unset ( $max_value   );
    }
    //--------------------------------
    echo '
    </td>
  </tr>
  </table><br>
  ';
    // Added in version 3.6.22, index.php, line 1126




$lang_referer[3] does not yet exist in your language file.
You can add in the file language/english.php for example:
$lang_referer[3] = "Referer (domain only)";