National Pool are those candidates who received a nom but not an appointment from their nom source. They are still in the "active" hunt for an appointment as there are more appointments than nom sources/slots.
National Wait List are those candidates who, after all the appointments are handed out, are hoping that more people than expected turn down those noms.
1.) about how many typically go to the National pool as opposed to getting TWEs?
2.) Is there a NWL every year?
3.) How many get selected on average from NWL?