Well, like Randy said, the Nats has always been run by the AMA. I am not sure when the stunt event first started using Navy judges, but have an idea it was at the 48 Nats at Olathe. From that time until 72, Navy judges were used while the AMA provided the ED and organized the administration of the event. The AMA organized and provided the volunteers, including judges, at the 73 Nats. The PAMPA organization had its origin at a meeting during that 73 Nats, became the recognized Special Interest Group by the AMA for CLPA and with that, PAMPA was assigned the responsibility by and under the surveillance of the AMA to organize and provide the necessary manpower including the judges to administer the Nats, beginning with the 74 Nats at Lake Charles. (PAMPA also was similarly given the responsibility by the AMA to organize and run the Team Trials for the CL World Championships, the first Team Trials run by PAMPA was in 75.)
So, Randy's list compiles all of the Walker Cup Champions since its beginning in 1946. Robert, that should give you whatever numbers you are trying to generate.
Keith