I'm trying to use system.debug() thdisplay the number of records my trigger has changed. im using an integer counter that increases everytime a record is changed, and at the end it is displayed. the only problem is that debug is not displaying.

here's my code:

/*  This is a bulk Trigger designed to change the status of leads created before
 *  a pre-determined date to a pre-determined status automatically
 *
 * @Author: Greg Coley
 * @Created: July 20th 2010
 */

//Fires on the succesfull update of a lead
trigger oldLeadBulkStatusUpdate on Lead (after insert)
{
    //the status to be put in place of the older leads current status
      String newStatusForOldLeads;
   
   
    //set the new status below in format('Status goes between single quotes like this')
     newStatusForOldLeads = 'Dead';

   
    //the list that will hold the selected list
      List<Lead> oldLeads;

   
    //search for all the leads whose status we havent changed yet, because salesforce limits us to pulling only 1000
    //objects at a time from the db, we mus limit our search results, i limit to 900...just in case.
    oldLeads = [select id, createdDate, status, isConverted from Lead where status !=: newStatusForOldLeads limit 900];
     

   
   
   
    //Do not change this line.
    for (Lead ld: trigger.new)
  {
      //Create the counter, which will be used to tell us how many records we have updated.
      Integer changeCounter;
     
           
      //the predetermined date that qualifies a lead as 'old'
      Date   oldThreshold;
     
     
     
    
     //set the threshold date below in format(YYYY,MM,DD)
     oldThreshold = Date.newInstance(2010, 12, 31);
    
         
     //initialize the counter to zero
      changeCounter = 0;
     
     
      // provided the search returns any results we loop through the results and change the status
      // for the lead to the predetermined status, as long as the leads created date is before
      // the pre determined date.
      if(oldLeads.size() > 0){
      for(Lead currentLead: oldLeads)
      {
     
      if (currentLead.CreatedDate < oldThreshold && currentLead.isConverted == false)
        {
          currentLead.status = newStatusForOldLeads;
          update(currentLead);
          changeCounter++;
        }
       
            }
      }
      //throws feedback to the system log
        system.debug(' ________________________________________________________________ ');
        system.debug('|Updated: '+ changeCounter +' Records out of a possible 900                                        |');
        system.debug('|================================================================ |');
        system.debug('|Note: if the two numbers above are the same you probably have to                               |');
        system.debug('|run again. when the first number is 0, all updates are finished.                                      |');
        system.debug('------------------------------------------------------------------------------------------------------------------');
     
      
  }

}