diff --git a/htdocs/comm/propal/stats/propalestats.class.php b/htdocs/comm/propal/stats/propalestats.class.php
index dcfcf2ee41f..1091213abd4 100644
--- a/htdocs/comm/propal/stats/propalestats.class.php
+++ b/htdocs/comm/propal/stats/propalestats.class.php
@@ -20,7 +20,9 @@
  *
  */
 
-class PropaleStats 
+include_once DOL_DOCUMENT_ROOT . "/stats.class.php";
+
+class PropaleStats extends Stats
 {
   var $db ;
 
@@ -29,84 +31,29 @@ class PropaleStats
       $this->db = $DB;
     }
 
-  Function getNbByMonthWithPrevYear($year)
-  {
-    $data1 = $this->getNbByMonth($year - 1);
-    $data2 = $this->getNbByMonth($year);
 
-    $data = array();
-
-    for ($i = 0 ; $i < 12 ; $i++)
-      {
-	$data[$i] = array($data1[$i][0], 
-			  $data1[$i][1],
-			  $data2[$i][1]);
-      }
-    return $data;
-  }
   /**
    * Renvoie le nombre de proposition par mois pour une année donnée
    *
    */
   Function getNbByMonth($year)
   {
-    $result = array();
     $sql = "SELECT date_format(datep,'%m') as dm, count(*)  FROM llx_propal";
     $sql .= " WHERE date_format(datep,'%Y') = $year AND fk_statut > 0";
     $sql .= " GROUP BY dm DESC";
-
-    if ($this->db->query($sql))
-      {
-	$num = $this->db->num_rows();
-	$i = 0;
-	while ($i < $num)
-	  {
-	    $row = $this->db->fetch_row($i);
-	    $j = $row[0] * 1;
-	    $result[$j] = $row[1];
-	    $i++;
-	  }
-	$this->db->free();
-      }
     
-    for ($i = 1 ; $i < 13 ; $i++)
-      {
-	$res[$i] = $result[$i] + 0;
-      }
-
-    $data = array();
-    
-    for ($i = 1 ; $i < 13 ; $i++)
-      {
-	$data[$i-1] = array(strftime("%b",mktime(12,12,12,$i,1,$year)), $res[$i]);
-      }
-    
-    return $data;
+    return $this->_getNbByMonth($year, $sql);
   }
 
-
   /**
    * Renvoie le nombre de propale par année
    *
    */
   Function getNbByYear()
   {
-    $result = array();
     $sql = "SELECT date_format(datep,'%Y') as dm, count(*) FROM llx_propal GROUP BY dm DESC WHERE fk_statut > 0";
-    if ($this->db->query($sql))
-      {
-	$num = $this->db->num_rows();
-	$i = 0;
-	while ($i < $num)
-	  {
-	    $row = $this->db->fetch_row($i);
-	    $result[$i] = $row;
 
-	    $i++;
-	  }
-	$this->db->free();
-      }
-    return $result;
+    return $this->_getNbByYear($sql);
   }
   /**
    * Renvoie le nombre de propale par mois pour une année donnée
@@ -114,31 +61,11 @@ class PropaleStats
    */
   Function getAmountByMonth($year)
   {
-    $result = array();
     $sql = "SELECT date_format(datep,'%m') as dm, sum(price)  FROM llx_propal";
     $sql .= " WHERE date_format(datep,'%Y') = $year AND fk_statut > 0";
     $sql .= " GROUP BY dm DESC";
 
-    if ($this->db->query($sql))
-      {
-	$num = $this->db->num_rows();
-	$i = 0;
-	while ($i < $num)
-	  {
-	    $row = $this->db->fetch_row($i);
-	    $j = $row[0] * 1;
-	    $result[$j] = $row[1];
-	    $i++;
-	  }
-	$this->db->free();
-      }
-    
-    for ($i = 1 ; $i < 13 ; $i++)
-      {
-	$res[$i] = $result[$i] + 0;
-      }
-
-    return $res;
+    return $this->_getAmountByMonth($year, $sql);
   }
   /**
    * 
@@ -146,31 +73,11 @@ class PropaleStats
    */
   Function getAverageByMonth($year)
   {
-    $result = array();
     $sql = "SELECT date_format(datep,'%m') as dm, avg(price)  FROM llx_propal";
     $sql .= " WHERE date_format(datep,'%Y') = $year AND fk_statut > 0";
     $sql .= " GROUP BY dm DESC";
 
-    if ($this->db->query($sql))
-      {
-	$num = $this->db->num_rows();
-	$i = 0;
-	while ($i < $num)
-	  {
-	    $row = $this->db->fetch_row($i);
-	    $j = $row[0] * 1;
-	    $result[$j] = $row[1];
-	    $i++;
-	  }
-	$this->db->free();
-      }
-    
-    for ($i = 1 ; $i < 13 ; $i++)
-      {
-	$res[$i] = $result[$i] + 0;
-      }
-
-    return $res;
+    return $this->_getAverageByMonth($year, $sql);
   }
 }