Increment a Hidden Column value by +1 each time..

I have the following code segment & need to add in a third column called ttcount that needs incremented by "1"

- It always starts out with a value of "1" (when a ticket is created..)

- If/when that ticket is "Re-Opened", it needs incremented by +1

so, the question is how to alter the code below to update the ttcount field by 1?

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<!--- Hold off doing the Update unless the the form has been submitted --->

<cfif isdefined("form.KT_Insert1")>

<!--- Update the Status to Re-Opened and Owner to Unassigned in the tbltickets table --->

      <cfquery datasource="care">  

    UPDATE tbltickets

SET ttstatus=<cfqueryparam value="Re-Opened" cfsqltype="cf_sql_varchar">,

    ttowner=<cfqueryparam value="Unassigned" cfsqltype="cf_sql_varchar">

WHERE ttNum=<cfqueryparam cfsqltype="cf_sql_varchar" value="#url.id#">

  </cfquery>

</cfif>

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Note: the ttcount field is a hidden field as follows:

<input type="hidden" name="ttcount" id="ttcount" value="1" />