Most watched Christmas movie of all time?

It is hard to say as reruns are normative for Christmas Films, as with songs and records. It is difficult to establish totals and chronology. This is not as clear cut a task as say- box office take on say (Titanic) which we know was released in l997. THe lengthy life-span of Christmas movies on reruns complicates matters. I would imaging the various treatments of the Scrooge saga, plus such things as the much-advertised Santa Claus in Eastman Colorscope- no actors being cited but this was heavily advertised on TV when I was a kid- They would shout the title- then everybody is waiting to see Santa Claus!- in Eastman Colorscope- this is very odd as no names of actors and actresses were given, unlike say- Dragnet, starring Jack Webb.